Even before I found out about this it honestly did not surprise me, since there are always two sides to everything you have to seriously think that its obvious that if gay female sex can turn on hetero men so much then it would be the same for hetero women with gay porn and it's not hard to see why they would like it so much. Guys in gay mainstream porn are usually super fit with six pack abs, big dick and balls and sculpted bums that many straight lads to not have. Also, as many women have mentioned in similar threads like this one, there is also that in a lot of them the men actually enjoy kissing and touching and talking to their scene partners which is also a very big no no in heterosexual porn when you compare the two.
Tickled Pink, if you wish to see what else the male/male market for females has to offer then may I suggest you look up some 'slash' sites that deal with male/male pairings in fanfiction, drawings and other sites of the like. Some sites you may with to see and see what is on offer are -
www.fanfiction.net
Juné Manga ~ Where girls gather & Boys play...
Hope this helps.
Also, you might be surprised to find that a lot of this slash fanfiction are in fact written by women for women and a lot of it is hardcore sexual situations involved that are quite interesting to say the least. In Harry Potter for instance, a big pairing for women seems to be Remus and Sirius, followed closely by Harry/Ron, Harry/Draco and so on. It is quite an interesting world lol