Husband gets horny when I'm upset?

Krystal Witha K
Is it just me or has your partner noticingly become erect when you've been upset over anything at all?
It's happened for as long as I can remember and have asked politely why he may feel that way and he doesn't seem to really understand either.
I'm just curious if anyone else has any stories they could share to help understand. Not particularly that it's an issue at all but just better informed. I couldn't think of anything of that kind if I tried if he was to be upset? Any ideas or experiences with this?