Going exclusive ?

So I’m in my 20’s and even though I’ve had long term relationship they started off rushed and I was younger when it started. I’ve been seeing someone for a little bit and we both want a relationship we just don’t want to rush too much into it. It seems like the first real mature relationship. I think I’m the only one he’s seeing considering we see each other like every other day. I was wondering when to ask about being exclusive or if I just wait..? I was thinking to maybe bring it up at least a month in or so. I’d like to at least be sexually exclusive by then I think.