How common is it to have guys shave there legs?

My sisters new boyfriend who I met over the holidays shaves his legs. He isnt a swimmer,bike rider, or weight lifter or anything like that. But still shaves them as often as any girl. I dont care at all about it cause he is a nice guy and all. But I was wondering how many of you out there know guys who shave there legs. Is this all that common and I just have never seen it that much?