I understand, Husband uses pump and cock rings. There is a Deuce harness for men to wear and it has one hole for him and one hole for the dildo. We don't have it yet but it is on the way. We have done this with other harnesses and it has made for an enjoyable situation for both of us. The other harness aren't built for his to wear though and get uncomfortable.
So I have the Deuce coming and I am so very excited. Some prostate play has made things better too.