I'm not studying an emotive subject, I'm studying philosophy, that's part of my point, this essay was not on an emotive topic, it was concerned with assessing the academic merits of an analogy, really very dry. Anyone who did have a personal difficulty with any topic covered could talk to their tutor about finding ways round it.
In the OP's case, the students will have covered a range of topics in class and been given an idea of the sort of topics that could be on the exam. Anyone who felt unable to face a question on abortion, or organ donation, or road deaths, or drugs, or violent crime, could have talked to their tutor,
who would presumably have advised them to prepare for questions on a range of other topics, so that if such a question came up, they could answer the other one.
If you take this idea of emotional triggers further, then I'd suggest that more 16 and18 yos will have known someone close die of cancer than will have had an abortion. So no questions on GCSE papers that mention cancer. None on deaths in cars or through drugs perhaps. Unfortunately, facing emotional triggers, based on personal experience, is part of life.
The difference there is we are thinking about the experience of individuals. While issues that really do disadvantage one sex as a class should be addressed, with abortion we are talking about something that will have affected a small number of, female, individuals, not the same thing.
There's a real danger, if you move from considering issues that affect some individuals to applying consideration to one sex, as a class, your consideration becomes a restriction on an entire sex, based on gross generalisation. Not so far from thinking that because one woman suffers very badly with PMS to the extent of needing time off work, all woman are unreliable because they have periods.