There’s no telling what an alien’s motivation would be for wanting to make love to a human brain, but it’s safe to say that it wouldn’t be for the same reasons that humans have sex. aliens might see human brains as a source of knowledge or as a way to gain control over the human race, or they may simply find the human brain to be an intriguing and exotic creature. Whatever the reason, it’s clear that aliens would not be interested in human brains for the same reasons that humans are interested in each other.