well if they help you thats fine, if they hit on you youshould take it as a compliment and iof they get annoyed you rebuked them then you should back away slowly 
why do you think the ladies first-rule stuff happened in the first place? i dont see any other possible reason for it other tha it coming from sex....
i wouldnt worry about it. if someone does something and doesnt expect anything in rerturn then that perons a nice guy. and you can probably presume he;s single too
on another note, one thing i HATE is women who assume if i do something nice towards them, its because im hitting on them, and act in an arrogant/suspicious manner as a result. you shouldnt let it affect you

why do you think the ladies first-rule stuff happened in the first place? i dont see any other possible reason for it other tha it coming from sex....
i wouldnt worry about it. if someone does something and doesnt expect anything in rerturn then that perons a nice guy. and you can probably presume he;s single too

on another note, one thing i HATE is women who assume if i do something nice towards them, its because im hitting on them, and act in an arrogant/suspicious manner as a result. you shouldnt let it affect you