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No. If you are seeing humping between the male cats, there's probably a different reason.
This more of a dominance issue than a sexual issue. Even two females will do it. They are trying to show one another who is the superior cat in the house.
There is nothing sexual about it and they are not trying to mate. The humping is saying - hey, take that! I'm the boss! - It's perfectly normal.
This will ease with time and as the hormones settle.Let me know if you still have questions.
The one that they mount is probably the low man on the totem pole. They are keeping him there by showing dominance. Humping is very rarely a sexual problem and is more about dominance in almost all cases.