Men its very straightforward: you see an attractive woman and you want to have sex with her. I'm sure women are visual to but it doesn't seem as important and they aren't trying to get sex as much as men are. To me it's more about how you make a woman feel and signs of you being a good potential father and raising her kids. Women have more to lose with sex so it makes sense that they're picky and don't want to have children with just any man. There's no straightforward answer but I think men are always trying to figure out how to attract women.