Me (21M) and GF’s (21F) incompatible sex drives. What can I do about it?

Me (21M) and my gf (21F) have been together for one year now. My sex drive is crazy high and hers is really low. Initially, before we made it official, we used to do things almost everytime we met up. The sex is good and we would both have fun.

But as time passed by, we both have gotten a little taken up by uni course works (we’re both in the same uni). I don’t know if that’s to blame (I like to believe that to be the reason) but the sex has just fallen off. I have to pre-plan every occasion for it to happen and we never do things randomly which I miss quite a bit. We barely end up doing like twice or at best, thrice a month.

I masturbate quite frequently but even that gets boring after a point and I crave sex. I’ve never even considered a thought of infidelity and she’s also the same as me so that’s not something to be suspicious of.

I try to drop subtle hints as much as I can but even they don’t work much. The planning really takes away the meaning of doing it. We talked about her exes and it seems like they were more sexually active than me somehow, or atleast, she would ask for it than them coming to her.

I genuinely enjoy the sex and I want more of it, but at the same time I don’t want to force her into anything she doesn’t wanna do. How can I have a discussion with her about this?