She puts our baby's yoghurt on my organ then licks it OFF

Please help my marriage from crumbling. My wife always wants to lick my manhood during s*x. We got married early this year after she fell pregnant and eloped with me. I have told her several times that I don't like blow-jobs but she gets mad when I try to refrain her.

She ends up not even allowing me to have s*x with her for some days. At times she puts our baby's yoghurt on my penis then licks it all and the worst part is that she them kisses me after that. What should I do to stop this?