Funniest example I know is how vagina is masculine in French.
In Spanish some words for vagina are femenine and some masculine. The same happens with penis.
La vagina, la concha, el coño. How many more are there?
El chocho, el chichi, la chirla, la almeja, el papo, el potorro, ...
And a lot more.
Haha, fair enough. Lots of them if you count every dialect.