That's weird. According to reviews on it, they state it doesn't:
http://www.overclockers.com/asus-strix-gtx750ti-oc-edition-review/
**edit**
Whateverworks_19 had the wrong card selected. This is the actual requirements for the card:
http://www.asus.com/Graphics_Cards/STRIXGTX750TIOC2GD5/specifications/
and no it doesn't need a 6 pin adapter
**edit**