Kinda depends what you're looking for and what you're ready to put up with for lesbian mc content.
The game Caliross has some lesbian mc with vampires and a brothel. Maybe other stuff but I didn't go far enough to see more (I heard the master of the brothel can be turned into a cow if the character has been going the cow route)
There's a bunch of hetero sex tho.
Bmotv is an all female mc game but it has very little sexual interactions, it's more about having the mc and other character slowly turn into bimbos.
I mean, third crisis has some yuri but it's far from being an all female game.
Mission mermaiden is a platformer that has a lot of lesbian and mc stuff hapenning (some hetero and monster too but the best mc is with the female antagonists).
Rignetta adventure is monster centric but it has some nice mc with monster girls, like sirens or other.
(really cool pixel art animations too)
If futa is alright for you then Witch knight Anna might do the trick ? All female mc game but very futa oriented.
Odyssey of Gianna also has some futa, but is mc centric game with females only.
House of pandemonium is a very weird game with pretty much no sex but it does meet the "female only, mc focused" criteria.
but yeah I agree there's not nearly enough mc games where the sex scenes between female characters aren't just * wears a strapon *