But Leah and Ryan, 32 and 38, respectively, don’t fit these preconceived ideas. She wears pretty skirts; he wears jeans and trendy glasses.

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And in this, Millennials realize that they’re pushing the boundaries of the sexual revolution beyond what their parents might have expected and their grandparents could even conceive.

By and large, Leah and Ryan feel comfortable with friends their age knowing that they sleep with other people, but are not as comfortable telling older people (for this reason, and for fear of professional repercussions, they’ve asked me to change their names for this article).

In fact, Leah and Ryan are noticing a trend that’s been on the radar of therapists and psychologists for several years now.

Termed “The New Monogamy” in the journal it’s a type of polyamory in which the goal is to have one long-standing relationship and a willingness to openly acknowledge that the long-standing relationship might not meet each partner’s emotional and sexual needs for all time.

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.

For Kristina, two boyfriends are exactly two too many. When she arrived at Syracuse freshman year, Kristina had certain ideas about what her romantic life would entail.

It’s a Friday night in January 2013, the last weekend of the term that sorority girls at Syracuse University can go out until rush season is over, and so it’s pretty much destined to be a rager, especially for Kristina, a 20-year-old junior who jokingly calls herself the “Asian Snooki” because of her impressive ability to throw down. In a small bedroom in Kristina’s sorority house, her friend Ashley stands in front of a mirror wearing a blue miniskirt and a loose tee, the bagginess of which Kristina eyes skeptically. “As a freshman, you're like, ‘OK, maybe I'll find my college sweetheart and we'll be together forever and we'll graduate and it'll be perfect,’” she tells me later.

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.

Once Ryan learned that a permanently open relationship was what Leah wanted, he says, “There was a side of me that was ecstatic – the teenage boy in me that wants to fuck everything I see.