If I sleep with someone on first date does this mean I'm not boyfriend/girlfriend material?
It's hard to say whether or not a one night stand will turn into something more or not. If you like a person and feel safe with them, it's okay to sleep with them on a first date provided it's consensual and you are protected against unwanted pregnancy and STIs. However, it's important for both of you to be truthful on what you want or don't want from the start. If you want a relationship with that person, it's important to say this before getting hot & sticky in the sheets, rather than sleeping with them in the hope they'll want to be with you.