To the best of my knowledge, this is not a situation where we know for a fact there is an increased risk. The simple fact of having multiple partners will not necessarily put you at higher risk. It depends on who the partners are.
The other thing is that it has always been very difficult to define exactly what constitutes multiple sex partners. There is no operational definition for that. What's the number? Is it 2, 5, 10, 15? We don't know, and there are no data to support a cutoff that could be used in daily operations of screening cell tissue and organ donors or blood donors that would reliably identify those who are at higher risk. These groups that are listed in annex E correspond to groups of people who have been shown to be at higher risk compared to the general public.