Tubes tied

Mariah • Nerd. MCU <3
Hey everyone. Currently pregnant. Gonna have this sweet baby boy. But when I deliver I don't want a baby for a good while... Any BC I have tried makes me gain weight. Even pills. My husband said that he would be willing to get his tubes tied and untied when we wanted to have another. 
Anyone know what the likelihood of damage to him would be? Anyone tried it and successfully got pregnant again later? He doesn't want me to have to go through the weight gain again. I work out on a regular basis and eat right and it was still unstoppable.