Psychological studies have confirmed that childfree & 1-child couples are the happiest & have the least stress in their marriages. This is because childfree & 1-child couples can freely explore & nurture their relationship w/o the interference of children. Couples w/1 child, although they have a child, still have couple time & aren't burdened w/children as couples w/multiple children are.
Childfree & 1-child couples also don't have socioeconomic stress. They also have more discretionary income to cover things beyond the rudiments. They also have the time to develop & enrich themselves culturally & intellectually. Couples w/1 child aren't taxed socioeconomically as they would be if they had multiple children.
Childfree & 1-child couples have a rich, fulfilling love life w/o the constant inference of multiple children. They also have privacy. 1-child couples not only have privacy for themselves but their child also has the utmost privacy. Childfree & 1-child couples have the time & space to be individual people aside from being couples &/or parents. They also have the freedom to explore & express themselves, not to mention use their utmost human potential.
Parents w/multiple children are stressed in more ways than one. First of all, their socioeconomic situation is tight. They oftentimes are stressed because they can't make ends meet beyond the rudiments. They also have socioeconomic parity in their relationship which couples of multiple children DON'T have. In multichild families, the socioeconomic burden is placed upon the male.
Couples w/multiple children also have to put their individual goals & desires on hold, concentrating on the children's needs, wants, & desires. There are also dynamics in multichild families which aren't present in childfree & 1-child families. There are issues of sibling rivalry & favoritism which impacts upon the relationship of the couple. Children can manipulate one parent against the other in terms of sibling rivalry & favoritism.
Parents in multichild households have no privacy to conduct their own lives as children can be intrusive. Children are known to be the best implanted birth control barriers. Studies show that the more children a couple has, the less free their love lives are. Also living in crowded environment can cause tension & stress between family members as someone is bound to get on each other's nerves. If one notice, childfree & 1-child couples are in love w/life & are content. Now, look at the couple of multiple children-they are always SHOUTING & SCREAMING, if not at each other, then at their children. Childfree & 1-child couples look SO MUCH YOUNGER while couples w/multiple children look SO MUCH OLDER-do the math!