Hey, I'm RoeyTwins' brother. I've been reading all your comments and it feels like you're all against "breeding" as you call it, which I find strange. Why are you so against guinea pigs having babies? I get the argument that she's too old so it might cause complications, but you seem to be against it regardless of age... anyways, ignoring all this breeding discussion, what Sunshine said seems to match what we're seeing here, he's getting on top of her like he's using her for a foothold, trying to show he's stronger or something, and she's screaming out loud, doesn't seem like mating to me. For now we've seperated them, but we're not sure we can afford having him neutered...