Tbf, if you're already dealing with alien anatomy in bed, another human of the same sex isn't that weird. ;)

Goooood question, lol. Under the right circumstances, maybe? Jim knows he looks pretty damn hot, but I don't think he'd come up with, and go through with, the idea on his own. It'd be like making out with a mirror. (Not to say he hasn't possibly done that as a teenager.) But I don't think he'd complain if he had to kiss himself to save the planet either, lol.