Watch What Love Is (2007) HD Full Movie Free on SolarMovie. Watch What Love Is (2007) online free. When Tom comes home on Valentine's Day to a "Dear John" Letter from his girlfriend, he spends the re...When Tom comes home on Valentine's Day to a "Dear John" Letter from his girlfriend, he spends the rest of the night talking to his four best friends about woman, sex & love until five women show up and the battle of the sexes begins.