Keeping my male function is a high priority for me.  Agreement with the wife is I can grow breasts, but it's my responsibility to meet her sexual needs..   
I stop and take a break for a few months, as soon as I start to notice any issues.     White Peony along with PM seem to be a good combo for me.  I mostly use topical herbs and lots of massage & pumping to avoid too try much feminization besides breasts and nipples.   Progesterone cream on my nipples and chest seem to both enlarge my breasts, nipples and seems helps my erections.