Pregnant

I was married for 10 years. Divorced now. I found out she was fucking while she was pregnant. Is this normal? Does it turn anyone on?
Well, is not normal if she did it bare. She put "your" baby in risk.

I've had sex with several couples during pregnancy but I did always with condom, as I was dating other couples in the same time.

So, in my opinion. That's not normal if she did in your back
 
I don't think it is a big deal, at least for me. It is bad that she hasn't said it to you before fucking them. Lying is bad. But if you agree that she will fuck with another man and you allow it, than there is no problem.