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One night stands boost male fertility, according to a new study.

New findings revealed that men who have sex with new partners reach orgasm significantly faster and have better sperm than their more conservative counterparts.

The latest study involved 21 heterosexual men between the ages of 18 and 23 who provided seven ejaculate samples over a 15-day period.

Participants provided samples by viewing sexual clips the same time of day every 48 to 72 hours.

"In our study, men produced higher quality ejaculates when exposed to novel, rather than familiar women," researchers wrote in the study. "Additionally, men ejaculated more quickly when viewing a new woman after being exposed to the same woman repeatedly."

"An increase in the total number of motile sperm may result in higher likelihood of fertilization and greater ability to compete with other male's sperm, whereas a decrease in the time to ejaculation may decrease the likelihood of an extra-pair copulation (with a partner that is not your own) being detected," they explained.

"Our results have important implications for understanding selective pressures on male reproductive patterns, the plasticity of ejaculate allocation, and diagnosis and treatment in the context of male fertility," they concluded.

The findings are published in the journal Evolutionary Psychological Science.