My wife wants another baby because she wants a girl but i am against it that i may get a vasectomy behind...?

My wife and i have been talking about this for like two days now and its starting to turn into arguments instead of calm collective talking it out and such =/. Well she wants another one because she wants a girl well we have three sons and i am perfectly content with my sons and everything and i honestly don't want anymore kids and i do understand her wanting a baby girl and everything because mothers and daughters have that sorta special bond and what have you. But i have been thinking about going and getting a vasectomy done behind her back because its my body and i don't want to have any more kids.And i know it would be wrong to go behind her back but at the same time its my body and shouldn't i have a say? Please don't come at me with you should discuss it and compromise with your wife crap because i see on here all to often about women spouting off about controlling there own body and there own reproductive system. I would be willing to adopt but my wife won't even hear me out about that and its just starting to cause a rift cause she wants a baby girl so bad. Unsure what to do, Advice?