About a month after the radiotherapy, the pubes above the penis fall out because they're in the entry/exit wound area of the radiotherapy beam, so you'll get a chance to look then! About 3 months later, it was all regrowing again. It looked super neat when it first started regrowing, and it happened to coincide with my pump clinic appointment. The guy doing the pump demo even commented on how neat it was, but I hadn't been doing any manscaping!
A year later and it's noticeably thinning again, but this time it will be due to the hormone therapy which I've been on over 2 years now.