Context: Just like in canon, Ben single-handedly defeated Looma and became his wife, but his own Tetramand wouldn't let him have it easily.
In reality, this "training" is just an excuse to punish Ben for marrying another Tetramand and making Looma jealous... XD
If you want the Alien Force design, let me know :D
P.S: The muscle that moves your cock is the same one that allows your ass to tighten, so... Tighten your ass if you want your cock to be stronger xD