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Physical effort: High Inverted

Birthday Party: acrobatic position with an armchair and pelvis raised

Birthday Party is an advanced, acrobatic position. The receiving partner lies on her back on the floor with her weight on her shoulders and upper back, pelvis raised high and legs folded back towards her head. The penetrating partner holds a decline plank above her: hands on the floor beside her head and feet up on the seat of an armchair behind him. Penetration, vaginal or anal, comes from above and can be very deep. It demands strength, flexibility and a lot of care with the neck.

Also known as: Birthday Party position

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Illustration of Birthday Party: Acrobatic position: she rests on her shoulders with her pelvis raised and legs folded back; he holds a plank above her, hands on the floor and feet on an armcha
Anatomy and biomechanics

The receiving partner lies on her back on the floor and rolls her pelvis up until her weight rests on her shoulders and upper back, never on the neck. She folds her legs towards her head: one leg almost straight past her head and the other bent and hugged with her arms. The penetrating partner places his feet on the seat of a stable armchair behind him and walks his hands forward to the floor on either side of her head, forming a straight, inclined plank with his pelvis over hers. Penetration comes downwards and can be very deep; he controls the rhythm with small movements of the hips, while his wrists and shoulders hold his body. There is no eye contact or kissing, because her legs are between their faces, and body contact is limited to the pelvis. Her neck and lower back take load, so keep it short.

Why this position works

Some couples are drawn to it as a challenge: a position that needs coordination, strength and trust, and that feels very different from everyday positions. Penetration from above can be very deep, which some people find intense and others uncomfortable. It is something to try briefly and with care rather than a position to stay in; sensations vary from person to person.

Power Play Vigor and Energy Sensory Exploration Complete Rhythm Control Difficult High Mobility Required Penis-Anus Configuration Penis-Vagina Configuration

Variations of this position

Variation 1: a folded blanket under the shoulders

Same position, with a firm folded blanket under the receiving partner's shoulders to protect the neck.

Only the support changes: a folded blanket or flat firm cushion under the shoulders and upper back, with the head resting just off its edge on the floor. The shoulders sit a little higher than the head, so the neck stays free of weight and is not forced to bend so far. It is the safest way to try the position.

  1. Fold a blanket into a firm rectangle and place it where the receiving partner's shoulders will go.
  2. She lies down with her shoulders on the blanket and her head on the floor just beyond the edge.
  3. She rolls her pelvis up and folds her legs back as in the basic position.
  4. He gets into the plank from the armchair; stop if she feels any pressure on the neck.

Variation 2: both legs bent and hugged to the chest

Instead of stretching one leg past her head, the receiving partner bends both legs and hugs them to her chest.

Only the legs change: both knees are bent and held against the chest with the arms, instead of one leg stretched out over the head. It asks for less hamstring flexibility and the body feels more compact and stable, although the pelvis sits slightly lower, so he may need to adjust the height of his plank.

  1. From the floor, she rolls her pelvis up onto her shoulders.
  2. She bends both legs and hugs her knees to her chest with her arms.
  3. He adjusts his hands closer or further from her head until his pelvis is over hers.
  4. Use short movements and stop if she feels pressure on the neck or lower back.

Variation 3: the penetrating partner's knees on the armchair

He rests his knees on the edge of the armchair seat instead of his feet, so the plank is shorter and less demanding.

Only his support changes: knees on the front edge of the armchair seat, shins on the seat, hands on the floor. The lever is shorter, so wrists, shoulders and core work less and he has more control over each movement. The angle is a little less steep; the receiving partner may need to lower her pelvis slightly.

  1. Put a cushion on the edge of the armchair seat to protect his knees.
  2. He kneels on the edge of the seat and walks his hands to the floor on either side of her head.
  3. She raises her pelvis and folds her legs back to meet him.
  4. Move slowly; if he feels the armchair shift, stop and reposition it.

✓ Tips
  • Use a firm surface and a stable, heavy armchair that cannot slide; stop at once if anyone feels unsteady.
  • The receiving partner's weight goes on the shoulders and upper back, never on the neck; a folded blanket under the shoulders helps.
  • The penetrating partner needs strong wrists and shoulders for the plank; if they tire, rest the knees on the armchair instead (variation 3).
  • Thrust with short, controlled movements: with a strong push from above, if the penis slips out it can bend and be injured.
  • For anal sex, use plenty of lube and a condom, and go slowly; stop if there is pain.
  • Keep it short and come out of the position slowly: lower the pelvis first, then the legs.
Interaction type
Vaginal or anal penetration from above, inverted angle
Active anatomy
Penis
Receptive anatomy
Vagina or anus
Main stimulation
Very deep vaginal or anal penetration from above
Setups and participants
Couple · 2 people Hetero

Frequently asked questions

Is it suitable for beginners?

No. It is an acrobatic position that demands strength in the arms and shoulders, flexibility in the hips and back, and care with the neck. Try it only if you are both comfortable with demanding positions.

Is it dangerous for the neck?

It can be if weight goes onto the neck. The receiving partner should rest on her shoulders and upper back, with a folded blanket underneath, and stop at the first sign of discomfort.

Can it be done without the armchair?

The armchair is what raises the penetrating partner to the right height. Without it, the angle is lost and it becomes a different position.

What should I do if I feel discomfort?

Stop straight away and come out slowly: lower the pelvis to the floor first, then the legs. Change position or depth before trying again.

Safety and evidence 2 topics · 3 clinical and academic references

Scientific context for common terms used on this page. Keeping these terms makes the content easier to understand; the sources clarify what is established and what remains uncertain.

G-spot: what the evidence says

“G-spot” is a widely used term for a sensitive area of the anterior vaginal wall. Scientific literature has not established a discrete anatomical structure with an agreed location, size and nature; sensitivity and response can vary between individuals.

Sources
O'Connell HE, Sanjeevan KV, Hutson JM. Anatomy of the clitoris. The Journal of Urology. 2005. PubMed ↗
Vieira-Baptista P, et al. G-spot: Fact or Fiction? A Systematic Review. Sexual Medicine. 2021. PubMed ↗

A-spot / AFE zone: limited evidence

The “A-spot” or AFE zone has been proposed to describe a deeper area of the anterior vaginal wall. Available evidence is limited and does not support presenting it as a confirmed anatomical structure.

Sources
Chua Chee Ann. A proposal for a radical new sex therapy technique… the AFE Zone Stimulation Technique. Sexual and Marital Therapy. 1997. Original article ↗

Reviewed by the editorial team ·

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