Movie from the 80's, can't think of name... Help!!!?!

My boyfriend is trying to think of the name of a movie from the mid 80's!. It was about 4 teenagers!.!.!. 2 boys, 2 girls!. They hang out in an amusement park together where they met!. After hanging out for a while, they end up swapping girls since they are more compatible with the other!.

Thanks in advance!!Www@Enter-QA@Com

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