Precisely that is one of the reasons why playing harem games attracts less and less attention, especially where
include that kind of forced threesome. Because let's be honest it is really possible to have a threesome without the need for participating women to be lesbian / bisexual.
I think that's because many people and devs, don't know what harem really is, what the genre is about, what the kink is about, etc. Many think that they are doing an "harem" game just because the MC fucks a few girls, and obviusly they have to make every single female a bisexual, even if she was straight at the beginning, she will be later bisexual, because that way is easier to them to do group sex scenes.
But that's not harem, in an harem a bunch of girls/boys decide they love and want to share 1 guy/girl (which is the MC). The girls in the harem may be bisexual, but that doesn't mean that they all have to be bisexual, and of course they shouldn't have sex/relationship with other girls in the harem, unless the MC decides about it. Since you know, the point of the harem is that they all are in love with the same guy, not with the same guy and all the other girls that are members of the harem, that's not harem that's a polyrelationship and it's not the same. I like harem games, but I don't want to share the girls, even with other girls, so unless I'm the one deciding that in the threesome they play with each other, when the time comes for a threesome or foursome, the girls should focus on the MC, not the other girls and sometimes the MC.
