1. You never have to ask (ever). He goes down on you without you even having to keep scooting up on the bed little by little until eventually his head is in your crotch. He's going for it not just because he knows you like it but because it turns him on too.
2. He doesn't give up if it's taking a while. He doesn't complain about lockjaw, or impatiently stop and go right into sex or just come up to loudly sigh and then go back to licking. He knows he's down there to perform his due diligence, and he's not coming back until he does what he set out to do.
3. You never "owe" him a blow job. He just lives in the moment and moves on to whatever's next in your sex lineup. He looks at going down on you the way some look at raising children: Doing it is its own reward. Maybe he doesn't look at it exactly that way though because using children in a metaphor about cunnilingus is fucking weird.
4. You're pretty sure he'd eat "Your Vagina" flavored potato chips. He seems to really, really like it. Maybe he's even submitted it to the Lay's Do Us a Flavor contest (he didn't win).
5. Cunnilingus is foreplay every time. Always. Sometimes you have to tell him you just want to have sex and he actually looks a little disappointed. That sad face is the face of a man who wishes that face was all up in your vagina.
6. He does it in the middle of sex. It takes a lot of focus and self-control to go from actively having sex to not having your penis in a vagina. If he likes to switch things up mid-coitus, it's because he really, really enjoys it.
7. He welcomes your feedback. (But you don't have much. He's really, really good at it.) Practice makes perfect, and his oral skills are pretty close to perfect. Which means he's gotten lots of practice in. Everyone has their thing. Some guys hit the gym a lot, some guys build model trains in their free time, and some guys just really, really like going down on you.
8. Sometimes you have to make him stop. One orgasm is enough, and yet he's still down there. If you need to beg him to stop, dude's a keeper.
This article originally appeared on Cosmopolitan.com. Minor edits have been made by the Cosmo.ph editors.