Your erection and penis strength is dependant upon the strength of your sex muscles, namely your pc muscle. You can exercise your penis muscles to make your penis stronger, your erections harder and improve your ejaculatory control and sexual performance.
There are a few things you can do to increase your sperm. One is to not wear tight clothing that holds your testicles close to your body. This makes conditions too hot for sperm production and it also goes against the next thing.
Stimulation of the testicles causes sperm production, so wearing lose clothing allows them to hang down, swing, and bump into your legs (not painful like it sounds). You can also help this along by gently messaging your testicles. This has the added benefit of unclogging any blockages you may have, which you will know if there is a spot that is sore and/or painful.
