Simple answer - "NO!"
My circumstances are, completely different from yours, but my experiences may help answer your question.
Since before my first JY holiday in 2009, my personal and marital life has been far from straightforward, but this has not been an issue at all with JY. There is no culture of people on JY holidays being on the pull, nor have I ever been asked awkward questions.
While the majority of people I have met on my 3 JY holidays have been single, some have been happily married, others like me, in neither situation.
These holidays are very special!