Seashell: curled up on the back, knees to the chest, partner kneeling
The Seashell is a deep, face-to-face position in which the receiving partner curls up like a shell. Lying on the back, they pull the knees tightly to the chest with the legs together and hold their own feet above the face, so the pelvis lifts off the bed and the buttocks rest against the thighs of the penetrating partner. The penetrating partner kneels upright facing them, with the hands on their buttocks. Penetration can be vaginal or anal and is usually deep. It calls for flexibility and loads the receiving partner's neck and lower back, so it is best kept short.
Also known as: Shell position · Curled-up position
Anatomy and biomechanics
The receiving partner lies on their back and rolls up: the knees are pulled tightly towards the chest, the legs folded and together, and the hands hold the feet raised above the face. The pelvis lifts off the bed and the buttocks rest against the front of the penetrating partner's thighs. The penetrating partner kneels upright facing them, knees apart on the bed and torso vertical, with both hands on their buttocks to hold and guide the pelvis. Because the pelvis is tilted upwards and the thighs are pressed together, penetration is usually deep and tight. The penetrating partner sets depth and rhythm; the receiving partner, curled up, has little room to move. The weight rests on the receiving partner's upper back and shoulders, and the folded thighs press on the abdomen. The penetrating partner loads the knees.
Why this position works
Some people like the depth and the tight feeling that the curled-up position gives, and the sense of letting go while the other partner controls the movement. The faces are close enough to look at each other. The penetrating partner can free one hand from the buttocks to add manual stimulation of the clitoris, and some people find that combination especially pleasurable. It is not for everyone: depth and abdominal pressure can be uncomfortable, and sensations vary from person to person.
Variations of this position
Variation 1: firm cushion under the pelvis
A firm cushion or wedge under the receiving partner's pelvis holds it up instead of the penetrating partner's thighs.
The pelvis stays raised without the weight shifting towards the upper back and neck, and the penetrating partner does not have to hold it up. The angle is almost the same, so penetration is still deep but more comfortable to sustain.
- Place a firm cushion or wedge where the pelvis will go.
- The receiving partner lies back with the sacrum on it.
- Pull the knees to the chest and hold the feet.
- The penetrating partner kneels close and adjusts the height before starting.
Variation 2: feet on the penetrating partner's chest
The receiving partner lets go of the feet and rests the soles against the penetrating partner's chest, knees still bent.
The body is less rolled up, so the neck and abdomen are under less pressure. By pushing with the feet the receiving partner can slow the pace or limit depth.
- Start in the Seashell, holding the feet.
- Let go of the feet and place the soles on your partner's chest.
- Keep the knees bent and the legs together.
- Push gently with the feet to regulate depth.
Variation 3: knees apart on either side of the chest
The receiving partner keeps the knees pulled up but opens them, bringing each one to the side of the chest.
With the thighs apart, the abdomen is not compressed, penetration is less tight and the clitoris becomes more accessible for manual stimulation. It needs more hip opening.
- Start in the Seashell.
- Open the knees and bring them towards the sides of the chest.
- Hold the feet or the backs of the knees.
- The penetrating partner frees one hand for the clitoris if you both want.
✓ Tips
- Start slowly: with the pelvis raised and the thighs together, penetration is deep from the first moment.
- Put a pillow under the receiving partner's head and upper back, and do not push the weight towards the neck.
- Hold the position for short periods; if the lower back, neck or abdomen bothers you, lower the legs and rest.
- Use lubricant; for anal sex, plenty of it and a condom, and go slowly.
- The penetrating partner can free one hand to stimulate the clitoris while the other holds the pelvis.
- Avoid it during pregnancy or with neck or lower back problems; stop if there is pain.
Key facts
- Interaction type
- Deep vaginal or anal penetration with the receiving partner curled up on the back and the penetratin
- Active anatomy
- Penis (and fingers on the clitoris)
- Receptive anatomy
- Vagina or anus
- Main stimulation
- Deep vaginal or anal penetration with the pelvis raised and the legs folded together
- Setups and participants
- Couple · 2 people Hetero
Frequently asked questions
Is this position suitable for beginners?
It is simple to understand, but it needs some flexibility and penetration is deep. Try it slowly and use one of the gentler variations at first.
Why does it feel so deep?
Rolling up tilts the pelvis upwards and brings the vaginal or anal opening towards the penetrating partner, so penetration goes further. Opening the knees a little makes it gentler.
Can it be used for anal sex?
Yes. Use plenty of lubricant and a condom, start very slowly and stop if there is pain.
What if my neck or lower back hurts?
Lower the pelvis onto a firm cushion and let go of your feet. If it persists, choose another position.
Safety and evidence
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.
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.
Reviewed by the editorial team ·
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