What Is Axillary Intercourse Or An Armpit Fetish?
Axillary intercourse is a non-penetrative sex act in which a man inserts his penis between the hollow of his partner’s arm to simulate penetrative sex.

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Axillary intercourse is a specific activity and fetish where you — or your partner — get off on having non-penetrative sex with an armpit.
Here’s what you need to know about axillary intercourse and armpit fetishes:
- Armpit sex is a form of outercourse (non-penetrative sex) known as axillary intercourse or axillism, in which an armpit takes the place of a vagina or anus for simulated penetration.
- Arousal from (and attraction to) armpits is backed by science, as the area secretes sweat and sexual pheromones that can subconsciously turn us on.
- Some people are genuinely aroused by the smell, taste, feel, or appearance of armpits, even if it isn’t a fetish, and a closed armpit visually resembles the slit of a vulva or butt crack.
- Having fetishes is very common so it’s not at all “abnormal” to be turned on by armpits or to prefer having sex with them.
Sexual interest in armpits is also known as maschalagnia.
Axillism (armpit sex) takes this arousal and desire for armpits to another level.
One partner’s armpit is used like a vagina or anus for “penetration” although the penis (or dildo) doesn’t actually go inside the body.
To consider it a fetish for yourself, however, you may have a strong preference for sex with an armpit over other forms of sex.

Medically Reviewed By: Susan Milstein, PhD, Human Sexuality