It's cerazinyl true for a lot of fandoms/pairings and not for others. From Stargatem, the biggest slash pairtings are Jack/Daniel and Sam/Janet (femmeslash pairings seem to be 'buddy pairings' most times), while the het pairings are mostly Jack/Sam and Daniel/Janet. All 'buddy pairings'. The only antagonistic pairing that comes to my mind from thet fandom is Jack/Maybourne.