Er.. are आप asking if they're allowed to have a girlfriend? Because I've heard of a company placing a dating ban on a group, but idols have been known to तारीख, दिनांक secretly to try and avoid scandal. Like Jonghyun and that actress chick, SM denied they were dating at first but eventually they had to कन्फर्म it and a big स्कैंडल happened.. and now Baekhyun and Taeyon.. but as far as I know, technically they're free to तारीख, दिनांक whoever they choose, though no one in SHINee appears to have a girlfriend as of today. I don't know if that made sense या if that was your question, but hope it helped some.
