You can use "I like a ___" to talk about things that you like sometimes. This phrase gives the impression of liking something a little bit, but also liking other things as well.
Notice that the example above doesn't mean that she likes one specific guy with a nice body, but that she usually or sometimes likes guys with nice bodies. Here are some other examples:
Sure, I like a nice glass of red wine with dinner from time to time.
I like a woman who's independent and knows what she wants in life.