I can relate to that5shit on this one a little bit.
They say long term use of ganja lowers testosterone levels. I believe there is something to it. It may be myth but i've also seen some scientific data on the situation. Depends on the person i guess. But when you think about it (at least for me) it makes me far less angry, I'm not the same person i was before smoking. Like i said, not as angry, WAY more passive then in the past. Also I feel no need to compete with the other alpha males in the pack as i see myself as ..shall we say.. a lone wolf?? cheesy i know ..but im sure some can relate.
As far as testosterone levels dropping. I don't know how true it is. My genetics contain large levels of testosterone ie; thinning hair, body hair, a metamorphic? (think that's the term) body structure, meaning i can obtain muscle in a short amount of time.
However, I experience problems sometimes sexually if I'm far too high. I think most of that is mental though. Weed makes you insightful right?? Well if your sleeping with someone who you have some reserves about, or having sex with someone who intimidates you or whatever the reason. I'm sure it's easier to lose your hard-on because your mind is focused on something else other than how great it's feeling.
I can't speak from a womans point of view of course, but it would be logical to say that it's effects are different for a female as far as the whole "tesosterone" thing.
But it's all up to the smoker in the end. How it effects their physical or mental state.