Check out:
http://www.nicehole.com/doublestuff/
Lots of hot photos of guys being double teamed.
Guys can be double teamed too - getiing fucked at one end while sucking a hard cock at the other (bit like being on a roasting spit). Or being double fucked.
My advice for the double fuck - have them take turns tagging you till you get opened up a bit then sit on one cock and bend forward to let the second guy in. Might take a few tries to make it work - but that can be fun too.