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I suggest going to xpmedical.com and using there information to pick out the right Adult Diaper for his needs.
The best adult diaper hands down is the Tranquility brand. The best place to learn about Tranquility is at a dealer's website drybritches.com here is the link for the video: http://www.drybritches.com/store/pages/About-Tranquility-Products.html
I am 100% bladder incontinent and I use a Premium Fitted Brief Diaper called Dry 24/7, otherwise I find that I leak so often that it sucks. If you type "XP Medical Adult Diaper Review and Testing" into your favorite search engine you will find adult diaper testing from a company that sells all different diaper brands (so it's more impartial). It will help you find a diaper that works best for your individual needs.
So long as intersex genetalia doesn't require special care, you could use nearly any adult sized diaper. Free diaper samples are rare nowadays, so your best bet might be getting a sample pack at places such as XPMedical and NorthShoreCare.
huggies
the best way is to wear baggy clothes and wear a small diaper
Huggie's
On rare occasion i used a Store Brand "Underwear" style diaper. However, no store brand diaper is very good.
Cloth Diapers are the best diapers, they do not have plastic, oils and eliminate diaper rash...Great company that we use in Arizona is For Baby And Me www.forbabyandmeonline.com
eq dry
The best way to find out where you can request diaper samples would be to research it on a parenting website such as TheBump.
There are many companies that sell unisex diaper bags. Some of the best are Petunia Pickle Bottom, Carters, SoYoung Charlie, OiOi, and Diaper Dude.