I'm reading all of this sex talk and thinking about Sarai and Tarkan. I do believe they had sex - I believe his claims. If he knew he was innocent, he really had no reason to divulge that information other than LE probably asked him the nature of their relationship. And he told the truth, IMO.
My guess on their relationship: they had been somewhat 'flirting' online, commenting on pictures, etc. Who knows what their private e-mails and iMessages and Facetime (and the like) said. I'm going out on a limb and saying that the sexual pressure/interest from both sides was rising. By the time she got there, they were willing to have sex anywhere at that point. But then I think after the initial sexual encounter (or two or three), the novelty wore off, and she didn't find him as interesting. She had gotten it out of her system. The same may be true for him, but I think *she* was the one taking this huge trip, trying to branch out, 'take a break', feeling that '7-year-itch', etc. I don't think their tryst was as much of a life-changing experience for Tarkan as for Sarai, considering he is reportedly a single male and she had been married to a guy she had been with since they were teens. I believe I read that she will be buried on the 15th anniversary of her husband's marriage proposal to her. They've been together awhile. So I believe Tarkan's lawyer when he says there was no emotional investment in the relationship - probably not from either side but especially not Tarkan. I do not think that makes him a jerk. It's just probably his lifestyle as a bachelor. In other words, I don't think he had enough feelings to have a reason to murder Sarai. No anger, no rage.
I'm backing off of Tarkan. I believe whoever murdered Sarai was someone she was acquainted with, either online before arriving or someone she had met previously while there - or a contact of one of those acquaintances. It could be anyone from a fellow IG'er, to the landlord, to the carpet guy.
As for Ammar, he seems like a sweet guy. He actually wore a tiger outfit to the airport to meet her, his 'tigress'. I'm on the fence about their relationship being platonic or not. I think the underlying reason for Sarai's trip was to 'find' herself, to spread her wings, to experience a part of life that she never got to experience and felt may be slipping away from her as she aged further into her 30s.
I think photography may have been a part of her reason but I think it was more of a cover-up to her family and maybe even her friends.
Whew. Hope this makes sense.