If the goal is reached on one but not the other, the model will usually perform the goal reached. I don' think many/most guys get confused because they don't care or think about it, they just see the goal being done, or they might just think someone tipped for it in a private tip or tipped earlier for it but they didn't see the person tip. I wouldn't worry too much about this part of it.
If anyone does ask, and they can't hear tips from another site and put 2 and 2 together, you could quite easily just say you're bored and want to try get guys motivated to tip, so you're giving a flash, or something to that effect. Guys wouldn't overthink this and they would (do) accept it because well, you've got your tits/pussy/ass or whatever out..
