Is it appropriate to have sex outside of marriage in Turkish culture?
Turkey is a country straight in the middle of east and West so there are cultural impacts. There are liberal and conservative people in turkey regarding to dating before marriage.
If you are going to live in big cities like Istanbul, Ankara or Izmir you will find it more liberal.
But traditional customs matter, and although you’re unlikely to cause offence through a social gaffe, it’s best to be aware of prevailing customs.
Also, many Turks are devout (or at least conservative) Muslims, so you should adhere to local dress codes – particularly away from resorts and when visiting mosques. If you really can’t spare the time, mime “thanks” by placing one hand on your chest and pointing with the other to your watch and then in the direction you’re headed.
If travelling alone, it’s best to stick to mid-range hotels (particularly in the interior) and schedule transport to arrive during daylight hours.
That said, the backstreets of most Turkish towns are a lot safer at night than those of many Western cities.
Nude sunbathing is not acceptable anywhere, though at any major Mediterranean/Aegean resort discreet topless sunning takes place.
If you venture much off the tourist track, accept that being stared at is part of the experience and not considered rude.
Students in universities campuses are open minded people.