In reply to cap'nChino:
> I've tried every thing to tuck my manhood away but it keeps getting caught or pinched in the leg loops. I have tested many harnesses but their all a little 'tight'.
A bit counter intuitive perhaps, but rather than being too tight could it be that the leg loops are actually a little too loose and leaving a gap for your bits to get caught up in? (I'm assuming you have adjustable leg loops?)
As Ffion Blethyn suggests above regarding underwear, sometimes more restrictive is what you want rather than less.
If that's not it, maybe you need a longer 'rise' between leg loops and belt - oddly, if you can find one big enough, it might be worth trying on some womens harnesses for that.
And failing that, how about trying a harness that doesn't have traditional leg loops as such. Black Diamond Bod, for example.
Or start hunting around for an ancient Whillans harness in good enough nick to use - you won't be worried about that nipping a bit of skin.