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Ask him what he likes and what he fantasizes about.. what he would want you to do/wear/say/etc.. And give in your comment/opinion as well to agree on something fun for both of you.
Agreed. Sure, we can give examples, but what I find exciting in bed might not be what you and your partner find exciting. So your best bet is to talk about your fantasies with him and see if you two think of something you'd both like to try. If neither of you can think of anything, you can visit a sex shop, browse an online sex toy store, visit the "Sex fantasies" thread in this subforum (currently just a few spots down from this one), or watch pornography for some ideas.
3nodding