So you solved your problem? Tell me how, I am boinkin this guy who is seriously into bondage, it can make me feel uncomfortable at times. So I want to know how to tell him to cute it the Drell out. n_n
... Wow, the word boinken. Aren't you the person who has several, nvm. Not me to judge.

Well to tell you the truth, you really can't a relantionship needs two things. Talk and sex. Bad of either means bad relantionships.
Hard core christian couples suck at sex (Well the majority do, you all don't have the exp. that us raging whores do who don't wait for marriage.) so they talk their problems out, and well talk to sortive orgasm as well. Bad talk, well look at the trailor park trash, one second they are screaming their farking heads off and the next you hear the woman screaming in extacy! Both of these relantionships are bad and either end or have some affect on their kid.
He likes bondage, hmm, and it appears you don't. Well, tell him straight up what certain things make you feel un-comfortable, and that you all shouldn't do it any more. Period. A true partner will respect your opinion and find other things to do with your body. If there isn't any thing you like about it, find another boink buddy.
Please please, no one preach to me about how sex isn't important in a relantionship because if you do you are a fark tard who doesn't have a good relantionship and if you think you do your partner is suffering, you don't think sex isn't a big part, go ahead, deprive yourself of your partner's body, go with out it for a few months and tell me its easy to not ignore the craving to taste your partner, tell me that if its easy that you also don't start looking at others. Your bodies are sex machines, so sex is a need for it in a working relantionship.
... I am begining to wonder why I was openingly asked this question online, this is a subject I know to much about.
Personally, if he is a true person who loves bondage than reverse the role, put him through it! I personally love struggling against- start sending PMs if you want more advice. This sortive talk should be slightly private.
Bottom line, tell him straight up, don't sugar coat it, if you want a working relantionship than be honest and hold nothing in.