Georgimama, I know what you mean. Any bloke who shows the slightest hesitation in wanting to have sex with his pregnant partner seems to be labelled as either having some deep-seated ishoos, or being deliberately cruelly neglectful to his DP, or just pig-ignorant about the location of cervix and uterus compared to the length of his penis.
I'm a bloke. When my (then) DP was pregnant with our first I was very hesitant to have sex with her. Not because I didn't think she was attractive and sexy - she was. And not because I didn't understand the whole "you're not going to poke the baby in the eye" thing. I did.
But this was our first child. The whole pregnancy was both magical and scary. I'd read enough books from Miriam Stoppard et al to know that there are a hundred and one things that can go wrong in an apparently healthy pregnancy. I would never have been able to forgive myself if we'd had sex and then a few days later some complication set in.
Even if, logically, there would be no real chance of a connection between the two, the base fear of that coincidence happening threw a large bucket of icy water on my libido.
By the time of my DP's second pregnancy we both felt a lot more confident about what was going on and the actual risks and so those irrational fears largely disappeared.
I'm not saying that what I felt at the time is what all men think. But I did want to counter the "If a man doesn't want to have sex with his pregnant wife then he's got some weird madonna/whore thing going on" nastiness.