"But the other side of me was concerned about what this means in terms of intimacy and how the dynamics would work." When Leah and Ryan met at a wedding four years ago, they didn’t expect to develop this type of arrangement.Neither of them had had an open relationship before, though it was something that Leah had contemplated.By the end of their dinner at a small Italian restaurant in New York’s West Village, Leah is getting antsy to part ways with her boyfriend Ryan, so that she can go meet up with her boyfriend Jim.

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I was very unsure of all that.” Leah, however, forged ahead. Her one concession to upstate New York’s brutal winter is a Syracuse sweatshirt that she can quickly jettison as soon as she enters any party.

“I want to be meaningfully connected and involved with a lot of people, whether or not that means in a sexual way,” she says before taking her leave. And she plans to enter plenty, beginning with a dorm gathering – where she pre-games with a water bottle full of vodka tonic – before moving on to the rugby house, where the sporty all-American type of guy that Kristina favors should be in abundance.

Tonight is one of those nights, and soon Leah will head to Jim’s penthouse apartment, where the rest of the evening, she says, will probably entail “hanging out, watching something, having sex.” “She’ll usually spend the night,” Ryan adds nonchalantly, which gives him a chance to enjoy some time alone or even invite another woman over.

He doesn’t have a long-standing secondary relationship like Leah (“I’ve actually veered away from doing that”), but he certainly enjoys the company of other women, even sometimes when Leah is home.

Ryan is a young Generation X’er, while she’s an older Millennial.

While both generations were raised by Baby Boomers – who not only initiated the sexual revolution, making acceptable the concept of sex outside the confines of marriage, but who then went on to mostly pair off in traditional marriages – hers was the generation in which the greatest percentage of those partnerships ended in divorce (the divorce rate peaked in the early Eighties, right around the time it’s believed that the Millennial generation began).

This generation is radically rethinking straight sex and marriage, but at what cost?

In Part One of a two-part series, Rolling Stone goes under the covers in search of new approaches to intimacy, commitment and hooking up.

I have couples that have closed relationships or open relationships depending on how they feel about the relative health of their relationship.