Writing in the Accident Analysis and Prevention journal, a team from Tampere Institute of Technology reveals the results of a study in which 6000 people were asked if they had actually had any kind of accident - or had nearly had an accident - while using a mobile.
  yes. they are called wet dreams. when a man sleeps hes usually dreams about sex, so when you have sex you ejaculate in there dream they are having sex.
No. You will still have erections and produce the same amount of semen when you ejaculate. The only difference is that the semen doesn't contain sperm. Some men say that the 'freedom' of not worrying about their partners' contraception helps and even improves sex.