It works. Many years ago I was flying HKG-BKK in CX F, the only passenger in the cabin. The (rather older than me, female) purser decided that a young (back then) chap like myself able to fly F (not that impressive, it was not much more expensive than an already reasonable J) was just what she needed. After a while, when she was actually sitting on the arm of my seat (!) And practically heaving her bosom in my face, I resorted to telling her I was going to BKK to visit my boyfriend. She skedaddled and I never saw her again!

I used the same technique when in Singapore on the MRT and was buttonholed by some god-botherers trying to recruit me as a Mormon. I pretended to be really interested for a few minutes, and said my boyfriend and I would love to hear more. Same result. Hehehehe...