We dated for a few weeks several years ago. She was a nice girl and all but we just didn't click so we remained friends and we are very close now. So anyways, this friend of mine, it a bit "out there". She likes to go to clubs and I honestly don't get it. She goes in and out of relationships fast. I love her but I don't know how to nicely tell her she has been being a bit of a tart lately. We never had sex when we dated, that was my choice. She has no problem going out on a date or two and getting the dead done. It scares me because I don't want her to end up with a disease.