 "Velma  is a lesbian; she has a crush on Daphne." Just because Velmas  boyfriend is not a member of the gang like Daphnes is does not make  her a lesbian. Neither does her being paired with Daphne when Freddy  goes of on his own to find clues. The writers actually seem to imply  in a number of episodes that Velma and Shaggy are seeing each other  (they are often paired together at dances and such in the series). 