https://www.psypost.org/2022/05/study-finds-women-are-more-jealous-than-men-of-their-spouses-opposite-sex-friend-63150?utm_source=dlvr.it&utm_medium=facebook

When it comes to opposite sex relationships
Insecurity and jealousy are words that are commonly tossed about when the man has an issue, but it’s generally called an inappropriate relationship when the genders are reversed. Should opposite sex relationships have stricter boundaries than same sex relationships? How do you handle this in your personal relationships?

This is assuming cis monogamous relationships.