Spice up my sex life?

hey, me and my bloke have been together for just over 3 years .. we only see eachother once a week due to work commitments, but speak everyday .... our sex life is great, he is dedicated to making sure im fully satisfied before we have sex, and i never fail to reach orgasm, wether its through oral sex, manual stimulation or penetrative sex, he always makes sure i climax before he does.... theres always lots of foreplay and lots of oral for both of us ... we sometimes include a vibrator and a spanking paddle in our love making so it is never boring ... we are both wildly attracted to eachother, but after 3 years i feel that our sex life needs to be spiced up a little .... we've already tried lots of things, dressing up, role play, toys etc .... so im having trouble thinking of something new we could try ... any ideas would be much appriciated!!! ... i also have a slightly embarrassing problem ... we do various sexual positions but the one i have a problem with is me on top .... i know he wants me to do it more, but when i do, he's very quiet and still, so i feel like he isnt enjoying it .. then after about 5 minutes he rolls me over, which makes me think im rubbish at it .. this makes me paranoid about doing it again ... i just dont seem to know what to do!!! when i grind, it doesnt seem to do alot for him.. he grabs my hips and encourages me to bouce instead..... but when i bounce, my legs get tired really quickly, and im uncomfortable .. where do i put my weight?? is it better to lean forward, back or sit up straight?? any tips would be fab, as this is the one thing im self concious about within our sex llife ... and id love to surprise him and be the one who takes control for once .... thankyou