Is it common to feel more sex-repulsed if you're surprised by the sexual content? Like, I found a thing that was explaining how T affects AFAB people's genitals, and had links to pictures, very clearly marked. And I was able to click over to one of the pictures, look at it briefly and click away without getting sex-repulsed, when if it had been sprung on me by surprise I definitely would have.
You are absolutely more likely to be sex-repulsed when surprised by sexual context. I think all of that stuff should be shared only with consent. That’s also how trigger warnings work, they allow your brain to say oh okay sexual content I’m ready for it. That way when you see it your gut reaction is panic or is repulsion to a lesser degree. It’s all about context and the choice you have in the matter. TLDR: Yes, very common. :)