Most reviews say that this is the weakest point in Hamilton's short movie career. This movie is a bit different from the rest, and considering it the best or the worst depends on what you expect from a movie, and what you expect from Hamilton.
Knowing Hamilton as a photographer, you can be slightly surprised. While Bilitis looks like his books in a movement with all those young girls discovering themselves and relations with each other on the edge of lesbian, with a plot connecting these scenes, Laura concentrates on few characters what enables developing relations among them (male-female, artist-model) but though we see beautiful photos, many of them better than his average, their number is reduced for the sake of the plot. Tendres cousines is different from both, it is only Hamilton's movie that looks more like a film than like a collection of moving photos. Because of that it can be acceptable to wider audience than Hamilton's fans, looking like an erotic comedy (but not German soft-core type - "Schulmädchen report" fans would be very disappointed). You won't laugh a lot, but you can smile (and that's something you don't often get from Hamilton). Unlike all other Hamilton's movies the age of female varies. Unlike other movies main character is a boy. Unlike his usual works this one isn't put out of place and out of time. We have characters that live their life, have their destiny and don't lead us only from one photo to another, from one nude girl to another.
Unfortunately, Hamilton (again) gets lost with a script in his hands. Girls on beaches, under shower, in low-light rooms, in gardens, under tents, in front of mirrors, regardless of the amount of clothes - this is his territory, he can shoot minutes and hours, and whatever he does you'll always feel the artist's eye and hand behind it. But when he has to present us average everyday life he stops being Hamilton and becomes average director who just follows the script. Hamilton is best known for his nudes, but they are just a part of his work. And in Tendres cousines we have a reverse situation: his girls are not in the best shots. Nature, garden, house remind us on Hamilton's work (often neglected part of it), while girls, even when nude, don't have anything special in the way he presents us. Maybe Hamilton was confused having a boy in front of camera, maybe he was thinking about a line that censorship would accept, maybe he was really trying to make something new (and no one dared to tell him he shouldn't), but he neglected what he was mostly praised for.

If he wanted to be accurate, he should have chosen some Frisco natives and not a bunch of NY actors who know nothing about the Sucka Free (not Sucker Free). I've lived in SF my entire life, and folks here do not talk or act the way these actors did. Everything was over-dramatized, and the only cat I saw from the Bay was JT the Bigga Figga with his little cameo as a rapper. No shock that he was the only one in the film who really dressed like cats out here (ie his Warriors jersey). Not once did I notice anyone wearing any Giants or 9ers gear; instead he fitted them in some cheesy made-up SF or Oakland jerseys that aren't even sold around here. HP has no bowling alleys, black and Asian gangbangers do NOT wear head or wristbands with the colors of Africa or China's Olympic team, nor does every Chinese gangster wear a Yao Ming jersey and try and sound black while shooting hoops. Further, while there now is a significant yuppie community that has invaded the Mission, all that was shown was some white dude and a self-proclaimed "100% West Coast Boriqua." This is NOT New York! Puerto Ricans here are few and far between, and the Latinos in the Mission are very, very different from the ONE that was shown here, who was without a doubt from NY. Also, HP is not the only black neighborhood in the City. An accurate depiction would have shown the drama between HP sets in their own hood as well as vs. Fillmore, Sunnydale, Lakeview, etc.
This film could've been much better if Lee had done some more homework and had a better storyline to work with.