By Kayla Kibbe If there’s one thing that’s definitely in for celebrity couples right now, it’s imbibing each other’s bodily fluids. Megan Fox and Machine Gun Kelly have their whole blood thing, and now Kourtney Kardashian is telling the world about drinking — yes, “drinking” — Travis Barker’s semen. The newlyweds, who each have three kids already from previous relationships, are apparently trying to conceive — and in typical Kardashian form, they’re documenting it all for the family’s new Hulu reality series. During a recent episode of The Kardashians, Kourtney opened up about a rather interes…