In Dublin's fair city, where the girls (and boys!) are so pretty, Tom, a lecherous university lecturer, charms his students with a metaphor comparing a goldfish's three-second memory with our own-each experience is a new thrill. This philosophy launches some fast-paced, short-sighted bed hopping. When Tom's lover Clara sees him kissing Isolde, she turns to TV reporter Angie, and when things go wrong between those two, Angie seeks comfort from her best pal Red, a horny gay bike messenger. Commitment-phobic Red, meanwhile, finds love with waiter David, while David's girlfriend is swept off her feet by one of Tom's colleagues.