Do y'all watch this series?
I love it. If you've ever cohabited, I think you'll find "The Couple" webseries just as funny as I do, in that observational humor kind of way. This is the trailer for Season 2, but I'm sure you've seen this. That just leads me to my larger point:
A friend today brought up the issue of why couples won't do certain things for each other. Sexually.
I think these are the two sides of this coin:
1. If you aren't in a relationship with someone, you don't care what they think. This allows you to be less inhibited. i.e., this is why people hook up on vacations and whatnot. If it's a purely selfish and short-lived act, you don't mind going for it; doing whatever, doing those "you only live once" sorts of things.
2. HOWEVER, if you do care about your mate, perhaps there's some complacency, but maybe there are things you won't do because of insecurity. They know your hangups, they've seen you at your worst ... maybe there's something less sexy about that? Familiarity breeds contempt?
Now, many couples have amazing wild monkey sex, so I'm told. BUT I do think there are many people (men) who could say they've gotten strangers to do things their partners would never do.