They're a good exercise if done correctly, good for quads, hamstrings, and I've found they're particularly good for your glutes. I don't do them often, I have a pretty regimented leg routine, but I occasionally throw a couple of sets in at the end of a leg workout if I've got a bit of gas in the tank. Don't ever be worried about stigmas being attached to the exercises you do. Lunges are popular among girls, probably because as I said they're good for the glutes, but I've seen even the biggest guys doing them. The only people that think lunges are for girls are the ones who routinely wear trackies to the gym to hide their extreme lack of leg muscles