To be absolutely honest I gave up on the idea of really good sex after 45. Enjoy your twenties and thirties. If you are in good shape in your 40's and aren't terribly experienced, ok..you may have some good sex.

My definition of good sex is uninhibited and athletic with a committed emotional component.

There is a 'spiritual' aspect to sex that I have not experienced much but that is because it seemed laborious and counter-intuitive.