Normally doctors give directions post TURP and they normally include when you can resume sexual activity. I guess your question is a little different than when you can have sex as that usually presumes that you are the one entering the vagina or anus. That guideline is usually after 4 weeks post TURP. I'd wait a minimum of 4 weeks if you are not going to ask your doctor for specifics on this. I really think I would not be bashful and get guidance from your surgeon. They don't care what your sexual activity is but wait the full 4 weeks and consider asking your doctor if that is long enough to be the receiver.