Translation of "Male's" in Japanese

The old male's extra size means he's far less agile than the rest.

‎大きな大人のオスは ‎身軽には動けない

Down there hurts, down there. Er, what do you call them? Testicles? In any case a male's 'important parts'.

アレが痛いんですよ、アレが。んー、何て言うの？コーガン？とにかく、男性の大事なものです。