Has he changed schedules at all recently? After having to put in extra hours at one point during our most recent pregnancy I went nearly two weeks without even trying to get near my wife, which is unheard of for us even when she’s not pregnant.
Were there any issues during your last delivery? I know several guys who either saw something that upset them during one of their wives’ deliveries, or just watched her first delivery and never wanted to touch her again. For some of them it started immediately. For a couple it wasn’t until she got pregnant again. One guy, the last time I talked to him, hadn’t had sex with his wife in over 3 years simply because he’d watched the delivery and now had huge hangups about her body and sex in general.
I also know a few guys who, out of the blue, started having problems with the idea of sex during pregnancy. None of them could explain why it happened because it never bothered them prior to that. They were either worried about harming the baby or turned off by either their wife’s appearance or just the idea of sex with a pregnant woman.
I wish I had some advice to offer on what to do about it, but I never found out if any of the guys I knew sought any sort of help or counseling for it. It’s also not something I’ve ever personally had a problem with, so I can’t offer advice from that perspective, either.