I have 3 adult rats, all three have been housed together for a week in a three level rat cage with a hide, bedding, and toys on each level. They have gotten along great, no spits or spats. (two females one male). I guess both of my females went into heat together.

My male rat has them cornered on the bottom level. And while he's on top of one female he's literally biting the other females tail to prevent her from leaving, but aside from the horrible sound she's making he hasn't drawn blood. Both females are attacking him And trying to escape,but he's not showing any signs of giving up.

Is this normal? I've done loads of research on breeding rats and I haven't read anything about this.