HMmmmmmm, i actually think you are bing a tinsy bit unreasonable. And moog dodgy?? Oh, come ON!
I think it probably comes from the girls actually. The guys probably don't know how to react and think its good to be popular etc etc. I wouldn't like it if it made my DD OTT though, but that would be my only concern.
My DD has just started pre-school and there is a male teaching assistant. He is lovely, but i have noticed the girls really give him a run for his money, they are chasing him around, play fighting with him and he is the fun and active person at the nursery. Im all for it, it is great to have a man at nursery and he is able to calm things down and be quiet and serious when he has to.
I know this might sound really weird, and i might get flamed for his, but i actually think the girls are doing a very innocent, totally non sexual form of flirting. If i mention DDs keyworker, Mr XX She goes all shy and silly and starts laughing. Its very sweet. I have an older DD too, she is 18 and as she was growing up i noticed the same "silly" behaviour towards my male friends. DD2, jumps all over my friend and gives him a run for his money - its just how they seem to interact.
I wouldn't read too much into it, you say you know one of the guys so he probably thinks that its ok to play with your girl. If you are really bothered by it, have a word, but tread carefully, just say, oh, she gets really hyped up messing with you and i have a nightmare when we get home, that sort of thing.
My Dad was like this, i remember getting very because he would throw the other girls in the air when i was in my first year at school.