How to approach fiance about bad hygiene?

So my fiance has acquired some terrible hygiene in the last few years. He showers like once a week (if I'm lucky), and when he does he just uses water no soap or shampoo, he'll wear the same pair of underwear for weeks straight, and I cant even remember the last time he brushed his teeth, I just walked into our bedroom after he's been on the phone with a friend for about 20 minutes and actually smells like a fart from him breathing and talking on here for so long.

It has gotten so bad that I just actually cant have sex with him, his balls smell SO badly, and I dont want a dirty penis INSIDE of MY BODY. I don't know how to approach him without him thinking I'm just being a bitch and calling him gross. I just honestly cant take it, he stinks all the time anymore and he used to be such a clean freak.

Ugh. Help.

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