Whats good about sex? Depends on each individual approach. IMO if you have to ask then you're probably too young heh. If two people love each other and not just lust for the body for instant gratification then there is a ton of GREAT things about sex. It definitely enhances emotional connections to the other person and makes you all the more closer. Plus there is the maternal factor if you have a child they're a permanant bond between the woman and man.
Don't just go out to have sex just for the sake of getting it on. At least develop some long term emotional connection first or sex can get real boring real fast.
A strong advocate for 4day x10 hr work weeks. 3 day weekend!