i am a male but i would like to be able to track my gf's menstrual cycle on my garmin watch. it says it is disabled for males. surely there is a way to be able to follow my gf's cycle?
The feature is enabled or disabled during the account creation, depending on the gender you select - menstrual tracking is enabled when you select Female as gender, or when you keep the field unassigned. You can try changing the gender in your user profile, but I am not sure it will have any effect, once the account was already set up.
However, even if it worked, I would rather discourage you from doing so, and mixing your data with data of someone else - it could have impact on most of your stats, including Calories calculation, training effect, Intensity Minutes, etc, etc. I'd rather recommend that she creates a Garmin Connect account for herself, and installs the GC Mobile app on her phone (even without any device associated). Or that she installs a specialized app for this purpose - I bet there are many, and probably better than GC.