He's had quite a few partners (10+) and I'm a virgin. I trust him, but I would like to make sure we're both clean before we have sex (I'm clean, obviously). He knows I'm a virgin and wants the first time to be special for me. One thing that would make me more comfortable would be knowing he's 100% free of STIs. I just don't know how to approach the subject. I don't want him to be offended and I don't really know what to say.