For me: the scare of "I have changed my mind and the sex we had 3 months ago was not consensual."

In the olden days, we'd meet, have fun, kiss, have sex and... whatever happened, happened.

Now, there is this realistic probability that what you thought was a fun evening, turns into a drama even a long time after it happened. There is no recourse, no evidence, no change of a fare trail: when s/he "does not feel it" afterwards, you're guilty.

Me personally will not flirt / hit on / touch anyone anymore.