@WombatChocolate
Personally, I think that some kind of stability for children to be born into and live within is important. Whilst women may be fully entitled to have sex with whoever they like and men too, to think that having lots of sexual partners has zero impact on that stability and hence the children is in my mind disingenuous.
Children mean compromise and sacrifice in lots of areas for both men and women. They mean having to think twice about things we might like to do and that we sometimes have to adjust what we do in all kinds of areas- that's not just for women but men too.
This 100%. ^
And can people just bore off with the pathetic scolding and scathing remarks against the (many) posters who think shagging a man when you're pregnant (who is not the father of the baby) is wrong, gross, weird, disgusting, and maybe even detrimental to the health of the mother and baby etc etc..! (Because DISEASES!)
Just get off your high horses, polish your pearls, and get over yourselves; people are entitled to their opinions and views, whether you like them or not.
And so what if people are judgemental about this? Everyone is judgemental about something, sometimes, and you 'saintly' oh-so-perfect people on here, calling posters judgemental and misogynistic and nasty etc etc, best not deny it, because we know YOU judge people sometimes too. (Men AND women!) EVERYONE does.
And trust me - as this thread illustrates - the vast majority of people will judge a woman who is pregnant, for shagging a man other than the baby's father when she is pregnant. They will also judge a man for shagging a pregnant woman. As has been said, some men are into that, and it's a fetish for them.
Yes, women are entitled to shag around (with men other than the baby's father,) when they are pregnant, but equally, people are entitled to think it's gross and disgusting and wrong. I can't believe anyone thinks it's OK actually, and to be honest, I am questioning some of the responses on here. 
Call me judgemental. IDGAF. As I said, EVERYONE is at some time or another, and don't even try to deny it.