While the bit about "cruising the streets for pleasure" could be about prostitution, it could also just be about young people roaming the city looking without any monetary compensation in mind. So, I would agree with people who think the song is about an intense affair that ends quickly just due to happenstance - new job or school or whatever puts people in different places before they've had the chance to discover how they really feel about one another.
While the bit about "cruising the streets for pleasure" could be about prostitution, it could also just be about young people roaming the city looking without any monetary compensation in mind. So, I would agree with people who think the song is about an intense affair that ends quickly just due to happenstance - new job or school or whatever puts people in different places before they've had the chance to discover how they really feel about one another.