I must say, bejkuy, that the nuclear family has been intensely problematic. It has been a huge factor in the reinforcement of capitalism, patriarchy, and heterosexual dominance. It has historically caused a gyno-thanatic power structure, and to this day places no value on the ideas and hopes of children.
I rue for the fact that wives still feel obligated to have sex with their husbands. I mourn the emphasis on monogamy which often stifles pleasurable sex. I am saddened by how the views and concerns of children are often silenced by parents who believe in forcing them into acquiescence in the names of "discipline" and "respect". I am pained by how children cannot express themselves sexually, with privacy and autonomy, because I knew how difficult my life might have been if I hadn't decided to face my sexuality at a young age and start living. I cannot abide by how materialism, and not pure love, is how a family believes it can express its affection. For those reasons, and for all the suffering they have and will continue to cause, the changes our society must make are not just legal, but also educational, religious, and familial.
Alas, in a world of scarcity - which the working class faces every day - the family is almost entirely materialistic. It has to be, for obvious practical reasons.
Also, sex within marriage does have a rather hypocritical air of prostitution in denial. Definitely not for everyone.