The unasked question is what would be his reaction if he did know all the details?
You are not married. You've said you've told your boyfriend about your interests and he has said he is OK with it, but doesn't want to know about it. You didn't say, but from what you did say, we'd assume you do not live together. Just exactly how is this senario cheating? We see no vow you are breaking.
Lots of couples might decline to play with you - it certainly isn't an ideal situation. There definately is a potential for problems between you and your boyfriend, and lots of people would be uncomfortable with him "not wanting to know". That is their prerogative, but calling you a cheater (i.e. a liar) is unfair.
For what it's worth, we'd suggest you consifder showing your boyfriend your profile. Tell him what you are doing - broad strokes, not details. He needs this information in order to make informed choices about your relationship. Make sure he understands this is about sexual adventures and not emotional attachments. Be true to yourself, and give your boyfriend the opportunity to accept you for what you are. Best wishes!