That is not true at all. I was a Sammy (Sigma Alpha Mu) Sweetheart. you don't need to sleep with the brothers to be one, that is actually not what it is about at all. Rather you are a woman who supports the fraternity in thier activities. For example, you attend philanthropy events, you help put up rush fliers etc. Actually, It is probably better if you don't sleep with them for the fact that once you have they will no longer respect you, and you will end up being the bad guy that came between the brothers