I get what you say, and yes, of course it isn't the biggest turn-on when your partner gushes on about every dick she has ever had shoved inside her. However, as far as I recall, Caroline talks about her exes during other times than just "naughty time". I could be wrong, cause it has been quite a while since I last played the game, but I believe I recall a number of times when MC isn't plowing her mouth or whatever when she talks about it.
On an a sidenote, thanks for calm response. Most people these days instantly go into attack mode when their opinion isn't shared with everyone. I always enjoy having my horizon expanded with new ideas and views on things.