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When I'm having a healthy erection with my GF... It just feels really sensitive and anything (touch, smells, sounds, thoughts) get it going. You'll know when you have one because you won't be thinking about how hard it is because you'll be so overwhelmed with desire and arousal. You'll just want to stick it in something wet and warm. I know my erections aren't great when I'm thinking about how hard they are, whether it will stay hard long enough, and whether if it goes down (we stop foreplay) will it come back again? Yes I'm anxious, but it's because I'm not aroused/horny enough to not think about the "what ifs?". Your erection is healthy when you really don't give a shit if it's heathy because you just wanna fulfill your bodies healthy, natural desires. It has taken me all my life to even feel what I'm talking about right now, but I do occasionally feel it, have amazing sex... But then go into a flat line again. Then process repeats. It's shit... But I've felt what can be achieved so I'm holding on to that with my life.

IMHO...........A healthy one depends on your age. from 14-28 years old you'll need a pipe wrench to piss and it shouldn't go "down" until you cum or just finish. It's a gray area from 30-50. Several variables, overall health, weight, etc. I personally had healthy erections until PIED knocked my dick in the dirt. I also had the libido of a 25 year old porn star.

There's more in play than just your dick when it comes to erections.....Your mind/brain is the driving force.

The young age range also includes a lighting fast refractory period. These days mine is about 3 hours.