How often do I have to use my parts for them to retain function?

Hi, I started E a month ago and the effects are going faster than expected, even friends are shocked. Anyway I'm concerned about losing the ability to use my private parts (pre srs) in the future, I'm unsure of srs at the moment and likely couldn't even get it for a few more years. I don't hate using them most of the time and do enjoy sex using them. So like how often to retain function, I've been having a lot of stress/little time for that stuff so I'm not in the mood and when I am it's too inconvenient. I can probably say twice a week is my average atm.