Men and women think of infidelity in different ways, with feelings of jealousy stronger for men when it involves sex, and jealousy ringing higher for women when it involves emotional cheating.

Those are the conclusions drawn from a study out of the Norwegian University of Science and Technology, which looked at how men and women respond to different types of infidelity.

The data proves interesting particularly as subjects studied were from Norway, where gender equality is higher than the global average: culturally, fathers and mothers share household and childcare duties equally.

For their research, scientists asked 1,000 participants to fill out questionnaires.

Authors theorize that jealousy isn't just ‘learned,' but an evolutionary response. That is, for men, sexual infidelity threatens their chances of generating their own offspring.

Similarly, emotional infidelity in men represents for women reduced time and investment in childcare.

The findings are published in the November issue of Personality and Individual Differences.