In whole world there is combination of male and female, either... Any society, human society, or bird society or dog society or animal society. Why this male and female? Why? Female is the energy, energy of the male. Why a man takes, marries a woman and takes responsibility...? Of course, in your country they marry as a matter of joke, immediately divorce after week or after seven days. But marriage means to take full responsibility of a woman. That is real marriage, Vedic marriage.