I've thought about this a ridiculous amount over the years because of my approx. 35 years long lover affair with the deadlift. I could be mistaken, plus injuries and physical weaknesses have a strong genetic link as well, but I feel lifts like squats and rows are more injury casing than deadlifts. Almost invariably people with bad lower backs never did ANY serious deadlifting either. And if someone is an avid lifter with a back that is out of order a lot I think a serious deadlift programme is the best answer.
I've torn and herniated a lot of muscles deadlfting but no disc issues. Obviously not saying it's not a risk at all either though.
I too have noted how weight lifting positively affects libido and general sexual functioning even very acutely. Easier to climax, shortening refractory period and so on. A heavy dead or a squat also seems to immediately increase gripping strength. The other way around, not so much.
I thought my usually supinated on deads bicep was probably immune from tearing after about 4 decades of heavy loading but I hurt it about 2 weeks ago. Still attached but there was some tearing and lots of pain. Ironically just 2 minutes before it happened I was yelling at a guy to keep his arm straight as he was lifting! 
Yes. Hack squats will also activate your body like deadlifts. Bench press does not have the same effect.
