Look at my erection, I'll be round, I'll be round

The story:

It was not me, it was my husband. I told him how Lennon had a knack for changing lyrics. For example during concerts sometimes he would sing "I Want To Hold Your Gland" instead of hand. Well anyways, this song was playing in the car we were singing along and my husband song this line. I just paused and said "Did you just say erection?" He said "Isn't that what he said? John use to switch lyrics around." "Yes, this is true, but not for that particular song I don't believe." I said.