I sellin' is legal, f*ckin' is legal then sellin' the f*ckin why isnt legal? ☺  
 what I think  correspondent   just mistyped  as letter " F " was omitted  
 so first "I"- read "If"
 so "If selling is legal " I think here  correspondent  make reference to entrepreneurship  success of  which often (and almost always)  depends on  selling/ marketing  techniques .  
So in  correspondent refers to selling practices as  to legal practices.
 .. and here  then correspondent using "iron logics" by some reasons I think  correspondent is from russia .. I even not checked yet lady's add .. so is she russian?
 Seems like she can be .. russian .. because I see in her posting as  we love say in russia when it comes to some nonsense  things( nonsense - but with humor)  
"iron logics" i think  americans would say also with humor ( in connection with this posting)
 steel reasoning .. ha ha ha  ..
-  marketing is legal  
- seems fucking in states still is ... legal .. so as long as two  events legal  they  MUST be legal and in connection .. ha ha ha it is how russian mind works .. and lovers  I  I must admit .. it is  why I hated and hard trouble with test as GMAT .. GRE .... you know which tests I am talking about ??  they are of course a bit mathematical but  in most parts they are  just on general perception and  processing  of information ..  so lovers ..  I do not know or correspondent was trying make a joke .. or she trully believes in such logic connection.. and from own experience ... ha ha ha on my very first years in states .. I would believe in the second  ..I trully trully trully was not able understand how  american mind works  and americans were not able understand how I do  process things ..now after many years here ..I am still ..  not true understood .. but ..I think I am more now on your coast then other.. as matter of the fact .. as much as russian women love to say bad about American men and  good about russians .. I never would  be able to be with russian man any more ..  even they are good lovers ..in bed I mean .. it is long story ..  ask me those who wants .. or even better take bottle of champagne  and invite me to talk about that and..may  be more .. Kissess and please yes give her brake  she just trying be fanny and have your attention kissess