Some people do it on a "tit for tat" basis. I would never want my wife to do anything she didn't totally enjoy in the first place. We rarely have sex anyway and if she's doing something she hates to do it really kills it for me.
I have been with other women that like it and my first wife couldn't get enough. Two or three times a day. I was younger then

To bad her ex kept getting in the way because of the child they had together. She didn't just swallow, she gulped. Some women gag at the thought of it and my current wife of 16 years says it smells like bleach. In all 16 years and even before we were married she's done it less than ten times and only twice to completion.
If you don't want to do it now you will probably never want to. Some guys don't care what you want either. It's all about them. Me, I can't be that way. The entire act of sex, start to finish has to be mutual or I feel moraly dirty.