Brothers dating each other

Women find them more attractive." It also turns out that our periods have a huge say in who or what we want.

"When we are ovulating we value promiscuity, aggression, dominance, willingness to engage in battle…

There is testosterone all over the place, along with intra-family competition, and intra-sex dominance with brothers who are always one-upping each other.

Like any science, there are exceptions to the rule -- and it's unfair to assume all men raised without sisters make crappy partners.

Parents, friends, and other non-sisterly influencers can do a lot to ready young boys to coexist with this new generation of smart, strong, independent women.

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