Adult Fun!

I was talking to a friend today and decribed a recent "possible encounter".  So I put an ad on craigslist, got a ton of spam and 1 real person that wanted me to drive to a 7-11 near her house, since she was going there to get more beer anyways, and she hoped I didnt mind she was buzzed.  After consulting the clock and finding it to be 1am I told her I would pass for tonight and if she was still interested the next day to let me know.
  This was the story i told my friend and was quite firmly told I need to open up, let go and stop labeling people (my labels come in a different rant).  I flat out asked her if the same oppurtunity came up for her would she have done it.  Her reply was yes, it would be an "adventure", whats wrong with some adult fun.  I attempted to explain that the labels I use mean nothing, I just dont think I could go hopping into bed with someone unknown, that I doubted I would find someone like that attractive, unfortunatly the first thing that came out of my traitor mouth (traitor in more ways I care to go into at the moment) was "I'm a parent before an adult I guess" and it started getting all heated. Yes I shouldn't have said it, no I did not appologize for saying it.  I tried to explain i would rather live the rest of my life knowing that if anyone looked at any part of it they would find it above reproach, I would like to stand by my values and not back down because its easier without them, I would rather live the rest of my life with no worries about someone finding this out about me, I would rather wait to make love then rush to have sex (instant gratifacation, yet another rant).  I would rather take the time to decide if I am ok with what I am about to do and if I will still be ok with it down the road.  Now this has nothing to do with judgement, it has to do with me, I find nothing wrong with casual sex, nothing wrong with adult fun, its just not me.  I would always be worried, what if that last chick decides to start coming to my place, what if the girl before boils my ferret cuz she feels snubbed, what if the girl alst night has a psycho husband.
I was told that I was too picky and that I have a fucked up way of looking at the world, if you dont know I often say my values and morals were much more common in the 40's and 50's, I'm a bit isolated because of this, maybe I'll go into that another time, probably not.
She stated that if she had been picky she wouldn't have found the guy she is currently with...o.O I, myself, didnt find this to be a good argument but hey I'm not trying to judge here.
This is where I get to my question, when did this kind of attitude become acceptable?  When did adult fun mean tossing away adult responsibility, maturity?  Or am I just fucked up in beleiving that driving to some strangers house to have sex isn't the most responsible of activities, that parenthood comes before adult pleasures/fun, and that not every adult activity is a mature activity.