anon, you bore me.
the only homosexual activity explicitly forbidden d’oraissa is two men having anal sex. that’s it. and based on talks i’ve had with various rabbis, most of why that was forbidden was because it put a man “in the position of a woman” and therefore was “humiliating”
obviously this is fairly cissexist and misogynist, so it’s been re-interpreted and reformed over time.
so there ya go.
also lesbianism/woman-on-woman sexual activity it not explicitly forbidden and is not mentioned in miqrah, but it is later said to be “frowned upon” d’rabbonim.
short answer: because Jews don’t consider the Torah as a strict rulebook free of interpretation.
shorter answer: go fuck yourself. Halachicly.