An Erectum is when the man inserts his penis into his partner's ass before it is erect, and then it becomes erect while sitting inside of their partner's ass.

the whale tail is the shape formed when a g-string rides up high over a womans trousers

When you have to poop so badly that your rectum feels hard. It is often harder to get all the poop out when you go since it is dense and very hard.

this word is pretty self explanitory

Like Rectum, but refers to the Shaft

Erectum; a horny ass hole.

Sexual arousal sensations Like Erection, only with your Rectum.