I had a one-night-stand a little ways back with a guy who seemed normal enough: cute curly hair, the not-socially-hopeless kind of geek, super cuddly and sweet. And the sex itself was okay if terribly ordinary--if I moan and say "ooh, I like that" after you spank me once, that is not your cue to never spank me again--but afterwards, he immediately ripped the sheets off his bed and stuffed them in the laundry bin. Then jumped in the shower and scrubbed himself down, and asked me "aren't you going to shower now?" and more or less made me shower.
And then bid me good night and was very sweet and cuddly again.
Huh. It's not like we got fluids all over. Maybe I'm gross, but I definitely would rate vanilla sex with no spillage as a Kleenex and shower-in-the-morning situation, not something requiring immediate decontamination. I don't think it was an insult to me, but there was definitely some weird hangup going on there.