Since there's no question of legality, it all depends on the situation (how mature is she, are you her superior, how far would you take it, how soon etc.?) and your own personal ethical standards. As a point of departure, I for one don't think a four year age gap would matter here, but various circumstances may lead to a different result.
Sound advice if you want to stay 100 % on the right side of your own ethics. On the other hand, 100 % ethics isn't all there is to life.RareDevil said:I've got one question to solve this.
If your sister was 16 would you want her going out with some one who is 20?
If the answer is yes or you don't have a problem with it then go for it.
If you would honestly say no, then don't touch it.
She is some ones daughter or sister man.