Those too, but if a man is getting his nails did he has outgrown his closet. I had celeb/pop/hollywood culture and choice of TV shows in mind. If he can talk to you about Rupaul's drag race episodes you could be in trouble. Feminine interests are things like fashion design, dancing, interior design, cooking and some crafts. Hobbies that are overwhelmingly female.
I have a few myself- but the emphasis is on overwhelmingly. It doesn't inherently mean he's gay, but homosexuals often lean towards female interests.