Well, if there's one word of advice I'd give to guys, it'd be "Don't damage your frenulum!".  I must have damaged mine a week ago with too much pressure on the DTR.  Everytime I have sex with my wife, the friction "negates" any healing that occurred since the last time we had sex.  I'm pretty sexually active, either jacking off or sex, so it's hard for me to do nothing. 

So heed my advice and don't overdo it with the frenulum.....