A straight female friend of mine told me once that watching lesbian porn gets her off. Do you find this odd?
No, I have a lesbian friend that gets off on male/male thug porn, go figure.
We all have the potential to get aroused by sexual situations, regardless of the genders of the people involved. You don't really need to sexually desire the people you witness to get excited by what they're doing.
Your friend may get off on the taboo/novelty aspect.
I suppose it makes a nice change, to see porn that involves the clitoris.
I even know lesbians who get off watching gay male porn. What is voyeuristically hot may not be the same as what one actually wants - or in some cases even can - do in bed.
I have heard of straight women getting off on lesbian porn and/or gay porn, gay men getting off on straight porn and even lesbian porn (I know a couple of gay guys who do), and lesbians getting off on straight and/or gay porn. Do straight guys ever get off on gay porn, though? We know they love lesbian porn, but I can't see any genuinely straight men getting off on gay male porn.