Not at all. I play Sophia's POV and boarding school route, and even from Sophia's POV, the entire point of the event is Marie pursuing Dylan, so even that is a straight event. If Sophia could pursue Marie on her own, without Dylan being there, then I could agree to it being a lesbian event.
And as I explained before, even though the Alyssa event predominantly features a female, it's also a straight event, because it doesn't require lesbian points, doesn't give lesbian points, and ends with Sophia getting dick (albeit a silicone one). The event gives Filthy points, which for the lesbian route after a while, are pretty pointless. As long as the Filthy point total is above the GW, the lesbian route carries on easily enough.
So even though both the Yoga and Alyssa events predominantly feature females, they advance the straight route, not the lesbian.