Yup, always support that if it's an option in the game. If it's not an option, fine, but if the MC is in a situation where they're asked for approval, not giving that approval feels way too callous and controlling. The only harem is the harem in which all parties are fully consenting to the situation, which means letting people be themselves (or simply deciding they're not right for the MC, if what they want is too different from what's on offer).
I mean if we are being literal with the term "lesbian" then no, there needs to be a dude in there so i can insert myself in and every girl in the harem needs to be part of his harem, but like some bisexual action where everyone is involved is PEAK.