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Beautiful people having hot sex and zero concern about actually having kids.
In fact, the possibility of losing contact with those beautiful granddaughters by the grandmothers wasn't actually a concern at all. Just as depicted in the movie.
And ANYONE who thinks 18 or 19 year old boys - definitely presented as boys in this movie - are "adults" have some serious deep thinking issues.
The women were basically sexual abusers using their boy-toys instead of BOBs (battery operated boyfriends;-) to get off.
Reminded me of Mary Kay Letourneau more than a bit. At least Mary Kay married and had babies by her boy lover. An actual better biological evolutionary outcome. ;-)
https://en.wikipedia.org/wiki/Mary_Kay_Letourneau
And what was up with Tom looking NOTHING like Harold??? Taller and much handsomer - square vs. receding chin - and those green eyes instead of the blue eyes that both Harold AND Roz have???