Unfortunately, the Old Testament rules seem to still heavily influence Christian thought - moral behaviour. The way women are treated, LGBT people, unmarried families etc - how much of that's derived from the Old Testament
For a man of his time, Jesus was incredibly feminist! And the "OldTestament Rules" that you complain about aren't God's rules (those are the commandments), they are the interpretations of those rules imposed by a patriarchal society.
Women had few rights because they were regarded as beasts of burden and as breeding machines (and still are in many areas of the Far and Middle East).
Sons were preferred because when they married, their wives came into their family - providing the man's parents with extra help, and someone to look after them in their old age - few ancient families raised more than one daughter, unless they were wealthy. You don't raise daughters to look after someone else. Wealthy families married daughters into similar families to increase influence and consolidate power. Poorer families raised one or two daughters (usually) as servants within the family or to sell into marriage (and sometimes slavery or prostitiution).
Female "virtue" was important because a man needed to be certain that the children he was raising were his.
As far as I am aware, there is nothing regarding lesbianism in either the Old or New Testaments (please give me the appropriate reference if I am wrong), but homosexuality was frowned upon because in an era of high infant mortality, war and starvation, men who did not want to have sexual relations with women wouldn't increase the family. This made the tribe weaker and more vulnerable to attack from other tribes or nations (another reason for wanting sons - protection/aggression).
Additionally, in the Jewish faith, it was (and as I understand still is) believed that a person never really dies until they are no longer remembered - this is why genealogy lists are so important. Keeping the name alive keeps the person "alive".
Not to have children was also considered an indication that you weren't favoured by God - you were "bad luck" (or at least women were, as they were considered the ones responsible for conception - men, of course, were always fertile).
Nowhere in the 10 Commandments is there anything that says women are second class citizens, or that homosexuality is wrong. NOWHERE.
We are all as God made us and that includes our sexuality We are as we are and there is nothing shameful in being gay or bi- any more than there is in being straight.
Those Christians who frown on homosexuality are not following God's instructions at all. Read the Gospels. Jesus said very little about sex - hardly anything, and what he did say amounted to "Be faithful when you have committed yourself to a relationship, respect the other person and treat them well - and don't judge other people's morals unless your own are squeaky clean - and they won't be, so don't judge, full stop."
Jesus, did say a lot about money, and about power, and I concede that many people who are purportedly Christian seem to gloss over this because it suits them to do so. (Not me - I don't have a pot to piss in or a window to throw it out of . . . ). 