doctors told me that in 6 months after treatment everything returns to order
It's a sensitive subject, but I believe most people who've treated with inf/riba experience what your bf is going through, both lack of interest and function. My husband, too, initially had some concerns about it, but we've managed to find other (less physical) means to fill our time and keep things interesting the last 72 weeks, and we're hoping things will return to normal as they do for many people after treatment. Good luck.
normally from what i read here and there
the effects after treatment normally lasts for sometimes, some complains about it lasting for longer than others
but this is specifically wasn't discussed as far as i know and i would love to know about it
if anyone knows and could tell us here