Here's a heap of profiles on a few different sites that might be interesting.
Confirmed: guys who've either mentioned that they skin back, or I asked them personally and they said yes.
http://guiarnaldo.tumblr.com/
http://www.dick.net/halfard
http://www.dick.net/jeffeffery
http://www.dick.net/yoman123
http://www.lpsg.com/members/camchain.html
http://www.lpsg.com/members/hansalami.html
http://www.lpsg.com/members/uncircumsized.html
http://www.showyourdick.org/member.php?w=114228
http://www.showyourdick.org/member.php?w=306566
http://www.showyourdick.org/member.php?w=384488
http://www.showyourdick.org/member.php?w=41858
http://www.showyourdick.org/member.php?w=439831
http://www.showyourdick.org/member.php?w=447235
http://www.showyourdick.org/member.php?w=466936
http://www.showyourdick.org/member.php?w=4812
http://www.showyourdick.org/member.php?w=89659
Unconfirmed but likely: don't know for sure, but they almost certainly have to be!
http://www.dick.net/azrael75
http://www.dick.net/darkwingdan
http://www.dick.net/eddie61
http://www.dick.net/uminin
http://www.lpsg.com/members/jerkhawk.html
http://www.showyourdick.org/member.php?w=128855
http://www.showyourdick.org/member.php?w=146941
http://www.showyourdick.org/member.php?w=161542
http://www.showyourdick.org/member.php?w=179934
http://www.showyourdick.org/member.php?w=194443
http://www.showyourdick.org/member.php?w=205623
http://www.showyourdick.org/member.php?w=387439
http://www.showyourdick.org/member.php?w=408422
http://www.showyourdick.org/member.php?w=418177
http://www.showyourdick.org/member.php?w=422652
http://www.showyourdick.org/member.php?w=440946
http://www.showyourdick.org/member.php?w=443405
http://www.showyourdick.org/member.php?w=445188
http://www.showyourdick.org/member.php?w=448356
http://www.showyourdick.org/member.php?w=459734
http://www.showyourdick.org/member.php?w=469033
http://www.showyourdick.org/member.php?w=549
http://www.showyourdick.org/member.php?w=59828
http://www.showyourdick.org/member.php?w=66863
Possible, but might not be: can't really tell for sure, but they've got some pics which suggest they do it at least part time.
http://www.lpsg.com/members/joo.html
http://www.lpsg.com/members/paneros.html
http://www.showyourdick.org/member.php?w=152646
http://www.showyourdick.org/member.php?w=20468
http://www.showyourdick.org/member.php?w=253377
http://www.showyourdick.org/member.php?w=323648
http://www.showyourdick.org/member.php?w=429420
http://www.showyourdick.org/member.php?w=430278
http://www.showyourdick.org/member.php?w=454242
http://www.showyourdick.org/member.php?w=484903
you can add me to that list on dick.net ... same name
Of course, how could I forget ;D