I know single people who have very active social lives and they are happy to be independant and pursuing their hobbies.
I also know singles who are desperate to find somebody, because they are very lonely and people around them are married with families.
Depends on one's personality I guess? For my colleague, he is a shy introvert, a very devout christian, super nice guy albeit nerdy with some weird quirks. He has been looking for someone for very long already, but no takers. After his birthday last year, he joked to us that he was now a "40-year old virgin".
Another colleague once asked him if he ever got the 'urge', since he was still a virgin. He said it was against his religion to pcc, so he just pray. *shrug* like I said, he was weird LOL