LIESSS... Then why you women always complain about your man not being romantic enough? lol.. When they are being romantic they are basically kissing your ass are they not? 
When a man kisses ass, it doesn't necessarily mean he'd let others walk all over him, especially when he knows what he is doing. Just have to know when it is appropriate to do so. 
well.....you didnt specify but yes, it depends on the situation. Like if its your wife - you better start kissing ass as soon as your get married.
if its your girlfriend or a potential - you gotta leave some breathing room and not give too much too soon.