For me there's no specific thing. I like to see a big bouncin' pair of tits but I've been teased that it's because mine are flat which is true
just as much as I like to read a 1000 page romantic novel... well no that's a lie, romance stories tend to be far to fake for my tastes.
One of my favorite things visually to watch is real couples going at it. Not just a flat out fuck fest but all the kissing and petting etc.
I can read a story and get as turned on as I would if I was watching some hardcore pump and dump. (actually made a category for this on one of my sites, quite popular)
My chosen profession has probably skewed my perspective, or it could be that I'm just more honest and have no fucks to give about people seeing me as anything less than sugar and spice and all that shit.
Really, I think any game that's WELL WRITTEN can entice either party to play it if it's well written. Don't play on any one trope to much, don't be wishy washy, if your MC is sexist at least make it make sense. What ever happens it needs to make sense in the plot.