Translation of "Erection" in Japanese

Don't lend money to someone who can't have a morning erection.

朝マラの立たぬ奴に金貸すな。

A morning erection: Will it last only until I take a leak?

朝立ちやしょんべんまでの命かな。

After all, having an erection the entire day is strange, isn't it?

一日中勃ちっぱなしっていうのは、やっぱり可笑しいよね。