Why My Wife Been Selfish About...........?

My wife just stopped taking the pill saying it made her gain 10 the last 2yrs and it mess-up with her hormones so her DR told her to stop it for a few mo. However, I don’t more kids any ways and I wanted to have vasectomy but I’m worried about how it will effect my life and my manhood. However, my wife wants to use condoms till I decide to have vasectomy saying that she doesn’t want put her health at risk and since I’m the 1 who doesn’t want anymore kids I should be responsible for it as well. Married 4 wife is 24 and I’m 33yr we have 2.5yrs old child.