You really should be consulting your PI’s. If its all good but looks “less veiny” then why stop? If they are bad of course take a break until things go back to normal. Although if this is really starting to make you concerned then do take a break until you feel that everything is lined up for a return to your PE routines. Sex and masturbation is up to you I guess. You could cut it out completely or maybe just reduce the amount you do if you can to hopefully help things recover. It’s all about how you are feeling about your unit.