Two enemies who are sexually involved with each other, but are not allowed to have feelings involved (In theory), as this makes the whole system crash.Enemies by day, sexual enemies by night. They are not allowed to tell anyone either, or go on dates. They do it all indoors and it has to be done by night or in a dark place where they won't be found.

I mean it makes sense for Jason, i dont see him having a girlfriend and a "normal" relationship.

So to this point i only could think of two girls.

Harley Quinn and Huntress.

Strange you mention this because his teammate Roy Harper was mixed up with an enemy for a long time.  

@crowncoke: Poison Ivy is to cliche at this point, i mean, she making out with another Robin.

The last time i remember she did that, The Governator was Mr. Frezze, also Ivy has being horribly overrated as femme fatal.

An that is one of the reason why she is so underrated as character, that an her freacking green skin and his freacking dumbass powers.

@RazzaTazz: It makes more sense, to be honest that a "pure" relationship, is hard to belive when you are using a suit and decide to be a vigilante that dont care about the law or dont care to be a criminal, you will have normal relationships.