Short answer is NO!
Masculinity does not change in anyway with a vasectomy. Your body even still produces the same sperm. The only difference is the sperm is not added to the semen during an ejaculation. Therefore, your ejaculate essentially remains the same with volume, color, texture, and even taste. To put it simply, your body doesn’t know you had a vasectomy.
There is no change in testosterone or any male hormone production.
More importantly, there should be no change to your sex drive (libido), sensation of your ejaculation, erection, sex, or orgasm. In fact, most men and women report improved sexual experience knowing the risk of pregnancy is removed.