I did a search on the forums and the main site but couldn't find a similar question to this, so here it goes.
According to this it is, but I would like to know to what extent.
Lets say someone is raped or molested and they associate sex (or men) with the horrible things that have happened to them. Are they exempt?
What if someone is taking care of their ill mother due to the fact that she needs round the clock care. Or if they are bound by work and school and they really have no time for a wife. Are they exempt?