I have two side document(so I use twoside option) in latex. I need to keep some material(text, pictures...) on one double page. In another words I want to allow page break from odd to even page but I want to prohibit breaks from even to odd page.

I tried to write macro:

\newcommand{\nl}{
\\ \ifodd\c@page
\relax
\else
\nopagebreak
\fi}

and use it instead of \ (I don't use any other line breaks commands in my document) but it does not work. Thanks for all answers.