Absolutely safe, Its depend on the place you choose. Corner seat is best place to kiss your girlfriend in theatre. In Weekdays, almost all theatres are empty in Chennai. so, kissing in the theatre is not a big deal. But before ask your Girl friend. Couple seat theaters are best to kiss your lover, they are more spacious and have no partition between seats. There are around 6 theaters in Chennai with couple seat. Choose wise on your own!