Third act problems? Nah. The narrowing of focus is earned in every beat and mood shift that came previously, and not knowing who our protagonists will be until more than 20 minutes in just makes it more poignant in retrospect. Personally, I gravitate towards the LAND AND FREEDOM point-counterpoint-debate-across-the-table stuff, and not so much the LONGTIME COMPANION-but-French bits, which is probably just cause I'm a crabby old lady. Mère Sean did sort of wreck me, though.
Beneath the fears on the surface (STDs, date rape, parental abandonment) are the murkier and touchier fears (vulnerability, betrayal of trust, and death (and Death)), all presented with a languidly creepy circa-70s suburbia vibe that feels like TEXAS CHAINSAW crossed with VIRGIN SUICIDES. The explicit depiction of what happens to the victims falls flat, and it doesn't quite play fair with its own rules, but (like MYTH) the beating heart at the center of everything won't be denied.