I don't know if it's wired into a person's DNA but I also don't think it's a conscious choice. I don't think anything that sexually arouses a person is a conscious choice. Some women I look at and think they're hot. I can't explain why, I just feel attracted to them. Other guys may look at the same woman and not feel the least bit excited.
A good example is that I think Danica Patrick (chick that drives a race car) is a major hottie. However, most guys on this board don't seem to see her as anything other than average.
Anyway, if a person is turned on by it and everything is consentual, then do whatever feels right (but be responsible).