What can I do to spice sex up with my boyfriend? ?

My boyfriend and I have been together for 4 years now. We used to have a lot of sex (2-3 times a day) but things have been slowing down recently (once every other day). I want to know what we can do to bring the excitement and spark back into our sex life? The problem is that we have already pretty much tried everything... bondage, videos, blind fold, butt stuff, dress up/role play, public sex, etc... so now we have run out of new things to do. Any ideas? Do you think not having sex for a while would be helpful? Maybe him and I should stop sex for a week or two so we are excited again after some time without sex?
What can I do to spice sex up with my boyfriend? ?
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