I think the past 4 years flying SQ F, I've never seen a F class cabin being served by more than 1 female FA, except on the ultra-shorthauls (BKK-SIN, KUL-SIN, CGK-SIN).

I've seen one female IFS once, but she stayed in C class for most of the flight, and the F cabin was serviced by 2 male and 1 female FA..

oh well.. all the pretty SQ girls are in C and Y anyways... you can't get EVERYTHING when flying in SQ F...