One of our torts seem to enjoy mounting the other a whole lot. They are barely a year old. We don't even know their sexes but from their behavior... We suspect the bigger one could be a male. Any ideas?
It's a dominance thing that both males and females do. They are establishing who's boss.
If it turns to biting and butting the subordinate tortoise may well become withdrawn which can lead to illness and death... so you must them separate them.