Seriously these guys don't know what they're missing. On the scale of straight to homosexual I'm WAAAAAYYYYY over on the straight side. It's really a matter of participating in something my spouse loves and finding the bright side to it.
The way she combines certain colors on her eye shadows and such are pretty interesting and it's nice to come home, after a long day of work, and see that she's been playing with her makeup. I
like green on her eye shadows and it gives me ideas for surprise presents during the year. As mentioned above I do get a chuckle at the guys who look like they're about to have a prostrate exam in any 'womens' store. I don't buy flowers or candy as, to me, that's too easy.
I'm no doctor Phil and I have my faults but, by taking an interest in my wifes passion for makeup, or my boys passion for video games, or my daughters interest in art and astronomy, gives me a way of letting them know how much I love them when I surprise them with something I saw light up their eyes when they looked at it.