(NSFW) Has there ever been an instance of you regretting having sex?

In response to a question about being able to change something from your past without disrupting how your life has gone, I answered that I would have had a lot more sex, since I have never regretted having sex, I only regret missed opportunities when I later learned a woman was interested in me.

I did get some feedback that a lot of women probably have instances of having sex they later regretted.

So, looking back on your life, any instances of regretting having sex?

I am speaking more to the act, not the consequences of unintended pregnancies or STDs. If those had not occurred, would yo still regret it?