you dont want to have sex in a jacuzzi period.... the water gets inside of the females and cause cause an infection.... water takes away a womens natural lubercation and could make it pain ful for her.... i would reconsider.... of just bend her over the jacuzzi and do it that way
There should be no problems. Just use plenty of lubrication and start slowly. Make sure your wife is comfortable telling you when to stop or go slower.
Have fun...