Some guys regularly worry about erectile dysfunction.

Others fret about how their penis stacks up compared to what's "normal."

And then there are men who have bigger, scarier, more debilitating sexual problems to deal with—like semen allergies and sexsomnia (yes, it's exactly what you think it is).

Here are five unusual sexual disorders (thankfully few) men can encounter in their lifetime. Thank your lucky stars if you never come across them, then start showing your manhood some love.

And in the meantime, adopt these everyday habits to bolster your fertility, strengthen your Johnson, and, for the love of all things holy, stop these bad behaviors that are hurting your penis.