I know for pre-op they told me to not have sex 48 hours before.
I am certainly no Doc but I believe there is nothing you shouldnt do. When you have your prostate still some say certain activities can give a false positive and such. Before my removal my doc said the same as yours but now with it gone he give no such advice.
Good Luck to you Steve and Shu93. I hope this is the first of many zeros to you both.