Best source to find a bull for wife’s first experience?

Started as a bull in my 20's and to be very candid, I believe once a husband allows his wife to be shared, she cant be unfucked.
While I obviously love to be with attached women, being the other guy, I see the dynamics change and the husband will more than likely never be the main guy again. I get the different arrangements but I am in a marriage and perhaps a hypocrite because my wife is not in the lifestyle.
Not true at all.