no
You don't have to but it's way better to get married and then have children.
To date, Darth Vader, Skeletor and Megatron. She has a thing for evil guys. Oh, and robots.
Budd and Kelly Bundy and in season seven there is a new addition to the family a boy named 'seven'.
If you are referring to former Special Forces SSG Barry Sadler; I know he was married at least once and had at least one son, Thor.