Because the studios and hollywood nowadays cater towards the whims high school brats and college partyiers, whio apparently are into '60s sex and stuff again.
OT: I wonder if Telltale's contract includes sequels; TWD and TWAU were signed up for multiple titles, but knowing how the GoT game turned our, it looks like they aren't quite too trusting on the gams market (many, many companies nowadays - ie, Warner Bros, have yet to catch up with the times and have failed to recgnoize video games as a major vein of revenue and thus continue to ignore, missing ut on big financial opportunities). Would love to see Telltale's take be continued. I'm frustrated, though, that they are depicting HBO's version of the world rather than Martin's.