Morbidly curious doesn't accurately describe what you are doing. I looked at your post history. You are obsessed. The answer is simple though. Most people are comfortable having sex with the lights off. Vision has more to do with observing physical attractiveness than the actual act of sex. Seducing, enjoying, experiencing sex all go pretty much the same way. It's different for every person and their personal preferences. I'm not sure why you are so focused on this question. If it's because you are interested in a person with a visual impairment, I suggest you get to know them for the person they are rather than their disability.

> How is it with sex?

As compared to what?

> How do blind people feel about having sighted partner?

Probably better than most sighted people feel about having a blind partner.

> How do blind people seduce?

I mean, I'd imagine it would be the same way you would, assuming you'd experience in the area.

I've only had sex twice since going blind, and I've had this condition for 5 years. The visual component used to be very important to me as a lot of my arousal came from visual stimuli so losing that resulted in negative experiences for me both times. In one of the occasions I even lost my boner after half an hour of sex and I don't have any erection problems, it's just that I wasn't having the full experience. When I masturbate the only sense that I imagine is vision.