10 Sexual Anatomy Facts That Aren't What you Think

That internal wall of tissue between the anus and the vagina - it has a name: the rectovaginal septum. And the perineal sponge—that’s erectile tissue that sits right on top of that septum—gets engorged during arousal, adding even more sensation. Wild, huh? 

Think you know your body? Chances are, you’ve got some surprises coming. In this episode of the Shameless Care Podcast, Robert and Anna unpack ten sexual anatomy facts that defy common assumptions — and may just change how you think about sex, pleasure, and performance.

Most of us learned the basics of anatomy in school — but when it comes to sexual anatomy, what you think you know is often incomplete or flat-out wrong. For example: the clitoris isn’t just the tiny external nub we all picture. It’s actually a much larger erectile organ with roots and bulbs that wrap around the vaginal canal. Understanding that anatomy alone can completely shift how partners approach pleasure.

Or consider the penis: most mammals have a bone to keep things rigid, but humans lost theirs through evolution. Erections aren’t “straight rods,” either — curvature is the norm, not the exception. And when it comes to orgasms, the neurobiology is closer to sneezing than most people realize. Weird? Definitely. True? Absolutely.

We’ll also explore the pelvic floor’s overlooked role in arousal and orgasm, the evolutionary reason men have nipples, how semen chemistry can actually trigger uterine contractions, and other bizarre but fascinating truths. Each fact comes straight from peer-reviewed research, explained with clarity and humor.

This isn’t just trivia for the bedroom — knowing the reality of sexual anatomy makes you a better partner. It builds confidence, improves communication, and helps dismantle myths that keep people from enjoying sex to the fullest.

As always, we keep it science-backed, sex-positive, and hilarious. No shame, no gimmicks, just the truth about your body — and why it’s even more fascinating than you imagined.

The Shameless Care Podcast: making sexual health smart, funny, and shameless.