I think your experiences in your marriage may be clouding your judgement here, @LooUpdate. MrShakes is not your ex and a bit of performance anxiety is not going to make him asexual. I think you’re at risk of catastrophising here, although I can totally understand why.
In terms of my experiences with MrSG, he would get bouts of performance anxiety really regularly at the start. He’d just lose his erection and/or would struggle to get hard. This didn’t happen all the time and, actually, was more likely to happen if we tried for a second round. He’d start worrying that he wasn’t going to be good enough or have enough energy or whatever and it’d make it difficult for him to perform. It happened the first time we DTD. He was clearly mortified and really grateful that I didn’t make a big deal of it.
It still happens sometimes, but I know just to cuddle him and not make a fuss and it’ll resolve itself (usually within 30 mins these days). He’ll even say now that he thinks he’s given himself some performance anxiety. It’s not a big deal in our relationship, but only because neither of us panics about it. We have a really good sex life - way better than I’ve ever had - even if he occasionally decides to totally overthink things.
I do remember googling about ED etc at the start though, because he’d consistently have issues with performance anxiety. It was really, really hard not to think the problem was me and my lack of desirability. It definitely wasn’t that, and it was definitely not anything to do with asexuality either. Actually, he told me that it was exactly the opposite of what I might assume; the problem was that he couldn’t believe his luck and didn’t think he could be good enough for me.
Also he doesn’t admit it, but I know that he’s dealing with self-esteem issues from the way his ex treated him. Obviously we’re both dealing with legacy issues from previous shit relationships (I’m kind of amazed that my awful ex didn’t actually ruin my experience of sex forever). It’s kind of inevitable at this point in life I think.