Yes, male goats love to watch a female goat get it on with another female, even if her beard is manlier than his. In most cases, it can turn him on so much that he wants to jump in and mate for real -- that is, in fact, the point. Unless, of course, the females kick him out because they've grown to like each other too much.
Lesbian goat sex, however, is not so much a hobby as it is a last resort. Much like an open marriage where a second woman is brought in to spice up the bedroom, a female goat will hump another female only if the male shows no interest in mating otherwise. Then she'll approach another female, and after probably coyly talking about how she's totally never done this before, they start mounting each other. A male will come running soon after.
Instead of viewing that, look at some horny goat weed, which is approximately the same thing.
And that's when things start to get freaky: Goat sex involves a boatload of urolagnia, which is the fancy-schmancy term for getting turned on by pee. She will piss all over the place in the hopes that the male will stick his head under the hot yellow stream, open his mouth, and soak it all up like a kinky little sponge. At that point, it is on.
And no, it doesn't work the other way; if the female just wants to laze around and watch Baa or No Baa, the male goat won't f**k another male until she gets the point. Even if she requests it, he would probably just laugh and bleat about how he's totally not gay.