I actually used the term 'manhood' in a story here precisely because it is so squickful. It was dialogue, though. I would never use it in narration.

I hate it when people use metaphors. If it's a sex scene, I don't want to be picturing swords or spears or flowers or any of that. I want to be picturing a penis and a vagina. You can get me to do that by calling it what it is. Penis or cock, vagina or pussy, depending on the tone of your story. Just call it the thing it is, please.

I got my frustration about that out in my submission for the story contest, which is more humor than sex. It's first person and the narrator is kind of a retard. She uses the most ridiculously flowery imagery for her vagina I could come up with.