I am 17 and currently have two plates, one is strictly friends with benefits, however the other I have been on a few dates with and have hung out with a lot more, let's call her "girl x".

Girl x is submissive, does what I say, has the same sense of humour as me (we genuinely make each other laugh), similar interests and she isn't at all sensitive when it comes to jokes (she is black and has sent me memes about slavery, this may seem irrelevant however to me this signals a personality trait that I admire a lot, not giving too many fucks.)

Girl x wants to date me and possibly get into an LTR, I told her I want to try dating her, but I told her to be prepared that I may not want an LTR. The truth is I don't think going on more dates with her is going to help make up my mind. Half of me wants an LTR with her, however, the other half of me wants to keep her as a plate and fuck other girls.

Although I feel as if this desire to fuck other girls is coming from a place of " if I get into an LTR with this girl I MAY never be able to fulfil my fantasy of a threesome, fucking girls of other ethnicities, fucking a girl who is extremely into BDSM, etc.)

My question is, how do I let this girl REALLY know that I don't know if I want an LTR or not (I know I do one day, as I want kids), and still get to keep her as a plate without upsetting her? (Maybe this is a beta goal and I care too much about not hurting feelings?)