To me, political lesbianism continues to make intrinsic sense because it reinforces the idea that sexuality is a choice, and we are not destined to a particular fate because of our chromosomes. I also suspect that it is very difficult to spend your daily life fighting against male violence, only to share a bed with a man come the evening. Then there's the fact that working with women towards a common goal means you develop a strong and passionate bond with them - why some feminists then block out the possibility of sexual relationships with their political sisters and instead turn to men for intimacy is beyond me.
Because "political lesbianism" reinforces the stereotype that women are not sexual; because it encourages straight women to appropriate lesbian experience; because it reinforces the stereotype that lesbians are all "going through a phase" that they can be fucked out of by men; because it encourages straight women to deny themselves a necessary, liberating, and life-affirming form of pleasure; because it inevitably leads to one-sided and sexually catastrophic lesbian relationships; because it prohibits transformative, mutually enlightening, feminist heterosexual relationships; because it blames women who are in abusive, patriarchal straight relationships for their own oppression, because they are "sleeping with the enemy"; because it blames straight women for the existence of rape and domestic violence; because it reinforces the stereotype that women are not sexual, that is, that they do not experience deeply felt sexual needs, that they can and should deny their sexual needs should they somehow arise, and that being a lesbian is not a naturally occurring, pleasurable, inherently worthy kind of female desire but a "lifestyle choice," which is exactly the point that patriarchal and anti-gay or "ex-gay" movements are making, and because all of the above is anti-queer, anti-woman, and deeply anti-feminist.
That's why not.
That's why not.