BAD IDEA
Can I fake liking a girl just to sleep with her?
Sure, you can pretend, but congratulations: you just enrolled in the School of Awkward and Heartbreak.
Yes, you can fake liking someone to get into their pants, but it's a rookie move that usually bites back. Unless you enjoy awkwardness, guilt trips, and possibly ending up with zero friends and a bad reputation, honesty is your best bet here.