What can I do about the guys being distracted by a new girl in D&D group?

We recently got a new party member, and she is … well, extremely distracting if you catch my drift. As the DM it is frustrating, because all the guys are trying to flirt with her, and shower her with items in game. The whole thing is quickly becoming a mess. (One even attempted to grope her, In the game and real life, an issue being addressed in a separate question) Seriously, I have no freaking idea what to say to the guys, and how to do it, the whole thing just seems so … awkward. Not only that, but I too have found myself attracted to her. How do I get my own, and my group’s hormones to be put away so we can play the game and have fun; which is what I’m sure she is trying to do also. We are a bunch of 8th and 9th graders and we are all friends.

Can someone help me?

Is a grappling character considered to be distracted for the purposes of an attack by a second opponent?

If a character is grappling a struggling opponent, and a second opponent attacks the character, would the DM rule that the distraction of dealing with the grappled opponent causes opponent number 2 to have Advantage on its attack?

I suppose it might depend on the nature of the Grapple. Merely grabbing an opponent by the wrist to impede his slingshot might leave you alert and ready to parry or dodge, but a more violent tussle, involving a grab with both arms would, I presume, leave you wide open for a whack from behind and thus at a Disadvantage versus a second opponent.

Even if you have followed up with a move to leave your grappled opponent Prone, I imagine that you are now kneeling, crouching or otherwise distorting your fighting stance in such a way (at least I cannot imagine that grappling a prone opponent can be done standing up) as to give a second opponent the Advantage.

I don’t see anything in the Rules (I have Essentials Kit Rulebook) covering this.