A lot of the people here seem to be saying that they are asexual because sex/relationships cause too many problems, which I read as "I would happily enter a relationship/have sex were it nor for the problems that they cause". I think being asexual is a bit more than that, its more that you either have no attraction to either sex or you even find the idea slightly repulsive. I don't enter into gay relationships because I think they would be inconvenient or difficult, but because I am slightly disgusted by the thought of myself participating in gay sex.
I think a more accurate term would be "celibate".
Second thing I'll say to all the people taking the line I mentioned above. Relationships cause problems? OH NOES! Guess what? People have been dealing with those problems for millions of years. Its what growing up is about. Getting a job causes problems, owning a house causes problems, cooking your own food causes problems, going on holiday causes problems. If I didn't want any problems, I could live at my parents house until the latest possible age, collect dole money or get some minimum wage, no responsibility job and spend all my free time in doors by myself. Problems are a part of life, and overcoming them is what living is about.
"I don't want it to end badly" - Do you not get a job in case you get fired? Surely the time you spend with each other should be all that matters, and if you are together for a half decent amount of time then the good times will easily eclipse the bad breakup.
"I'm not good in bed so I won't try it" - Do I even need to point out the number of reasons why this is stupid? Do you think that the people that have a lot of sex were born good at it? Heck, how many of them do you think are good now? The later you leave it to deal with it, the bigger a problem it will be.