I find a film I'm curious about, watch the trailer. Depending on what I started out with the list of "people who liked this film also liked..." can be long and rich and it's always difficult not to keep watching more trailers for a bit.
But I just discovered the best way ever to get a "quick fix" of "romantic" movies. :-D I generally don't pick a romantic movie when I get to watch full length ones (there are so many other genres to enjoy!). I stumbled on a romantic movie ("Dear John") and watched the trailer, then went on to another, then another and suddenly I was full and needed to see no more of it. :-D A few minutes was enough, no need to watch the whole film... X-)