I, for example, am very turned on by contrasts. So noticeable height differences, size differences (individual body parts or the whole package), skin tone, shapes, etc.
I kinda wish my wife (who’s very pale) were bi because I would love to see her have sex with a dark skinned woman that’s a similar height and weight as her, or a short, petite woman (she’s also tall for a woman).
Mine’s a little weird to explain but if a woman goes off to slip into something more comfortable (like, actual pajamas, not talking about the euphemism for changing into lingerie) I not only get turned on, I’ll get a little obsessed for a while. First time it happened was senior prom, I went with a friend of mine (just as friends) and afterwards a bunch of us ended up at her place playing video games. At one point she was like, “sorry you guys are stuck in your formal wear but I’m getting out of this thing”. She came back in sweatpants and a T-shirt and had ditched her contacts for glasses (I didn’t even know she wore glasses at that point) and for some reason, I couldn’t stop thinking about her for like, months. Tried talking her into dating a couple times but no-go. After that, when girls I dated would get into pajamas to chill with me for the evening, I’d always lose interest in chilling and want to take them right to bed. To this day it drives my wife nuts that she’ll buy sexy lingerie and not get more of a reaction than when she just changed into sweats.
I didn’t put the comfy clothes thing together until my wife and I started vacationing with other couples. Every time a woman we were hanging out with left to change into comfy clothes to hang out for the rest of the night, I’d be like, “Why the hell am I so attracted to Bob’s wife all of the sudden”. Eventually It clicked that I apparently have a thing for pajamas which was a huge relief because I was a little worried that I was falling in love with a couple female friends there for a minute. Turns out it’s a lot easier to turn off when you know what’s going on.