I don't consider myself to be a MILF, but I have had my sons' friends try and make moves on me before. I am younger (had my first kid in my early twenties) and am "exotic" (Colombian immigrant in a small southern town). I think those play more of a role than my actual looks. Just something different than what the teen boys here are used to.
The weirdest one was when my boys had a couple of friends over to watch a movie a couple of years ago. I believe they were 14 and 12 at the time. I was watching the movie with them and one of the boys (14 years old) put his arm around me. I didn't want to make a big deal about it and embarrass him or anything, so I tried to subtly get out of the situation. I yawned and I told the group that I was going up to bed and he stood up and started following me. I asked what he was doing and he said he thought I wanted him to come up to bed with me. I explained that I was sorry for the confusion, but that I absolutely did not want him to come up to bed with me. He apologized and returned back to the media room to watch the movie with the rest of the boys.
My oldest is a senior in high school now and has been asked by his friends if they can take me to prom if they can't find another date.