Most Helpful Girl
Generally speaking, women tend to initially be more aroused by touch & by emotional involvement. (There are always exceptions to this though.) However, with women, it's also probably 90% mental, so thinking about someone in a sexual context, or actual erotic fantasy can play a huge role in sexual stimulation too. Once a woman becomes aroused in other ways, she is far more likely to be turned on by what she sees as well.
I also think that as our society becomes more visual overall, that generality is changing a bit, & women are starting to become more stimulated by visuals as well.3