Taking a friendly selfie of you and the girl after you had sex with them has two major benefits:

safeguards you against fake sexual assault claim

boosts your SMV if you share it online (assuming girl is attractive)

I'd like to ask you guys, how should I have dealt in my situation.

Situation was this: had sex with a hot girl I met on tinder, she went to the bathroom with only underpants on, comes back to my bed, I try to make out a bit, and as we're doing it, I casually pull up my phone and try to take a selfie of her, and she suddenly tells me in somewhat serious tone that I should have asked for her permission first. Bitch, we just had sex, and were making out, how much more intimate must we get before you can trust me?

Now what should I have done? Because I can tell you right now, it wouldn't have been as easy as:

"oh, I couldn't resist the temptation to snap a pic of that booty of yours to later to jerk off to" as in a joke, because she seemed to be genuinely distraught by this and even the best "alpha response" would have left a bad aftertaste in her. Or was there something that I'd have done to alleviate her upsetness? Or is it one of those non-salvagable situations and you should just say "fuck it", and tell her to fuck off?

Has anyone been in a similar situation? Was I the wrong? I didn't take the picture, in fact, I wouldn't have even taken it if I saw she wasn't happy about it. But her sudden negative reaction came as a surprise to me, and I had no idea what to say. Also, it didn't feel like a shit-test, given context, we already had sex and she was about to go on her way.