I know that one of the side effects of M2 is increased libido and stronger/harder erections.
So does this mean that you get them sporadically more often, like of like when you were 13/14?
I work out quite a bit, so I don't want to be injecting something if it means I could get a spontaneous erection in the showers or something like that.
It's not exactly the case that you'll encounter sporadic/spontaneous erections as you did when a teenager...the feelings however share a particular wavelength/experience. I often do compare the random erection experience to feel like it did (best I can recall) as a teen (the brain to member signalling is something else...reminiscent of an early youthful feeling as compared to viagra/cialis enhanced or natural arousal).
When the MT2 aphrodisiac kicks in high gear, as an adult...it's most likely going to occur upon waking (or in the middle of the night when waking to urinate), visual/physical stimulation, scent maybe...etc. Anaerobic exercise will be n/a, what you need to watch out for is riding the bike on MT-2 (better options may be rowing or elliptical when beauty and friction surround you).
Mind over matter, normally you can tame the beast (worst case scenario, if at the water park/pool or at the office in slacks...you'll need to implement the waistband tuck).