I grew up with cats -- all my life -- my mother had 13 cats (at the most) one time. I married a "dog" man. So I had dogs for years and no cats. I prefer cats. They're more independent....can be left for a few days by themselves and don't drag in dirt -- well, not as much as a dog. I always had female cats and dogs --- hated what males would do (heisting/spraying/humping). SO, remarried -- he's a cat person. Went to humane society and got 2 males!!! They had been fixed by laser at 2 months 2 lbs. NEVER have had any of those problems with these guys. They're tuxedo cats --- black and white and let me tell you, they have more personality than ANY cat I've EVER had!!!
As for males more docile ---- well, one of my males just may be gay -- he's rather efiminate!!!! One is a brute and the other is my hugger/loveable boy. :) :)
If your son wants a cat -- go for it!!! The more the merrier!