Two men, one woman.
It seems to be a natural law that the most practical sexual combination is two men and one woman. And here's why!
A man is only able to fuck for a definite period of time before he either cums or loses his hard-on. A woman, on the other hand, can fuck as long as she wants to, whether or not she cums.
Also, after cumming, a man has to have a certain period of recuperation before he can fuck again, and even then he cannot usually "perform" at the level he did an hour ago. And the more times he fucks and cums in a short period of time, the harder it is to keep on fucking.
Women, sometimes, are multi-orgasmic, which means they can cum any number of times and are never diminished by the fact that they came earlier.
So, the presence of a second man will take the pressure off the first man and give him time to recuperate while the second man is fucking the woman.
Also, nature has designed the female body to accomodate at least two men at a time. First of all, she has two tits, so that two men can suck a tit at the same time. Any, male or female, who have had this experience, as have I, can tell you that it is very exciting to share a woman's tits with another man.
And, the woman has three available orfices in which a man can put his cock; her cunt, her mouth and her ass-hole. She can take two men in any combination of these holes as suits the three of them. It is even possible for two men to fuck the woman with both their cocks in her pussy. Again, I can personally attest that it is most exciting to feel another man's prick held tight against my own in my own wife's pussy while we fuck her together.
Many men fantasize about fucking with two women at once, but it is an unlikely scenario. The best he can do is fuck one while he eats the pussy of the other. And he rarely has enough cums for both of them.
So, this is the way it is"supposed" to be: two men fucking one woman. And marriage should only be an arrangement in which one man marries a woman with the promise that he will find those other men to give her the quantity of fucks that she naturally needs.
Fellow Cucks, that is our job, as loving husbands, to provide other men to fuck our wifes!