I'm with BBsq69. Why are you so obsessed with belittling Masha and Sasha's relationship.
Last night I saw two highly sexed people have a session that was full of lust and sexual passion. I didn't see much love or tenderness.....unless throat fucking or strangulation qualify in your book. Today it was all back to friendliness. There were no passionate farewells. M&S were right back to normal with no awkwardness. They've had sex twice already, in much the same way as they always did before (though to fit your theory, you claim she was "acting").
We might all like to dine out on lobster thermidor and champagne once in a while, though we wouldn't want to eat it all the time. TK was her occasional gourmet meal and she clearly enjoyed it. However, there is more to a loving relationship than just sex. Sasha obviously offers more......and she seems to enjoy the sex too!