How do you text a girl who you just wanna fuck and nothing else?

Just want to hear if you use other language or so in order to hint to the girl that you don’t care much else about her more than that you just wanna meet and have sex and that’s it.
I wonder because someone I used to date a bit, has changed the way he used to write in now when we started seeing each other again sporadically. His texts are much less enthusiastic and shorter than when we started seeing each other (1.5 years ago) when he asks if I wanna hangout.
As we don’t meet or text often, maybe every third week, I don’t wanna ask him about his intentions yet.
How do you text a girl who you just wanna fuck and nothing else?
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