"Normal" according to who. I've been married for over five decades and went through almost the same thing, but for the immigration issues. I understand your concerns. I now know about myself from my sex experience and education, and I am educated in social sciences, including psychology relating to sexual behavior.
You cannot undo becoming a cuckold once you become a cuckold, and I did choose to share my wife more than once; only once did she admit to making me a cuck.
When we got into the world of cuckold sex, I was high libido and, as usual, was prone to pre-ejaculation. You can "wear out the pole and not the hole." She was attractive in her own way, petite like an Asian, and therefore beautiful to both young men and older men as a potential sex partner. Overall, there's much less of a problem finding a male to service your wife than you finding another woman to serve you unless you meet the cultural definition of "stud" and such, the Hollywood guys.
Pregnancy was never an issue because I had a vasectomy at 25, and she had a hysterectomy later to save her life. The vasectomy, as it turned out, increased my sex drive. Ya, I wanted her to have sex with other men so long as I was in control, voyeur-like. I did not need to watch, just enjoyed the story and the differences between us. If she had wanted me to watch and play a part, I suppose I would have.
HIV was an issue back then too, but she selected a coworker on her shift, a man she worked alone with and appeared as someone clean, matching her desires.
There's much more to this story, and I will share it here or at another venue, even by email. Think it through; besides, it may be too late. You could be a cuckold, not considering how long she disappears. My wife did the same to visit relatives too. It's part of life in the jet age.
Last, her escapades that I know about became my favorite go-to fantasies as I masturbate in my old age. Off-topic, are you not thankful that you live in the Internet age and can learn what "Normal" means? Your keyword search ought to be these: cuckold, cuck, voyuer, voyuerism, swinging, and so on.