New York: High testosterone may be good for super sex but it is low testosterone that can help you keep your partner for long, a study reveals.

"The findings suggest that once people are in a relationship, lower levels of testosterone may be beneficial - or may reflect better ongoing relationship dynamics," said Robin Edelstein, an associate professor of psychology at University of Michigan.

Low testosterone levels may be a good thing for both men and women.

Previous studies have examined how testosterone levels are associated with the quality of men's relationships, but this is among the first studies to demonstrate the association among women.

The study used data from 39 heterosexual couples whose ages ranged from 18 to 31 and were in relationships from two months to seven years.

Researchers concluded that the quality of a person's relationship was associated with his/her own and his/her partner's testosterone levels.

The findings appeared in the journal Hormones and Behavior.