FPSMadPaul said:
I think Samus as she just looks better. (Especially in that zero suit!)
Chell would be your intellectual choice though.
Chell has thus far managed to maintain her identity as a SILENT protagonist, so I imagine she would be much easier to sleep with. No talking in her sleep, presumably no snoring...not to mention she probably sleeps very still due to sleeping in the same position for over a hundred years. She doesn't seem like the type to be a cover hog, either.
...Oh, wait. Are you talking about about sex? Cut the euphemisms, then. If you want to talk about sex, just say so. We're all adults here. Sleeping with people and having sex with people are two completely different things, and when offered no other context that can be very misleading.
On that note, I'm a straight woman, so this topic doesn't really apply to me. But if I had to get curious...I think I'd still go with Chell.