Testosterone is significantly correlated with aggression and competitive behaviour and is directly facilitated by the latter. There are two theories on the role of testosterone in aggression and competition.  The first one is the challenge hypothesis which states that testosterone would increase during puberty thus facilitating reproductive and competitive behaviour which would include aggression.  Thus it is the challenge of competition among males of the species that facilitates aggression and violence.  Studies conducted have found direct correlation between testosterone and dominance especially among the most violent criminals in prison who had the highest testosterone levels.  The same research also found fathers (those outside competitive environments) had the lowest testosterone levels compared to other males. 
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Good question – I think I’m taking 150 every 3 weeks. I will def ask about injecting myself – just concerned about the cost. I initially started becuz of sexual issues…lower sex drive. At one point I was going every 2 weeks and wanted to hump everything in site, and as a married man that wasn’t good, so I purposely scaled back to every 3 weeks. That said, my overall concern is how long is it safe to say on this stuff. I guess its safe until it’s not, but that’s just scary. I’ve gone to 3 different urologists and they never have a straight answer. I’ve now been off my shots for about 2 months….doing a little test drive to see how much of a difference it really is making…and I’m just now starting to feel a loss in strength and endurance in my workouts, BUT overall not too much else. Anyway, that’s what prompted to me do a search for “possible” alternatives.
thanks for your advice – appreciate it.