Having sex makes you happiest: iPhone survey

Having sex boosts our happiness more than any other experience, says a new study based on iPhone survey. Research involving 45,000 Apple smart phone users shows that making love is the best ever feel good factor. Respondents posted regular updates on their level of contentedness via an app. It showed Christmas Day is easily the happiest day of the year and people are at their most content at 1.50 p.m. on Dec 25.