Asking adult son to have sex with meWouldn't it be funny if that was the mother of the person who searched this? Much of what I wrote there applies here as well.
Here comes a very controversial statement, but I'm going to write it anyway because I try to give people practical advice...
In general, it is easier to seduce men than it is to seduce women.
Please notice I said in general. Broad generalizations do not apply to all individuals. There are many, many exceptions. People can argue nature vs. nurture all day (although notice that in other species, in male-female interaction males often have to do some sort of task before mating with a female). For our purposes, it doesn't matter why things are that way, just that they are. That is good news to the person doing the search.
There is, of course, the possibility that the son will have an aversion for different reasons, some valid, some not. A person's feelings and attractions and turn-offs and boundaries are their own, and they have to be respected.
Every situation is a little different. As always, I can be contacted via private message on Facebook (I'm at /fullmarriageequality) or at fullmarriageequality at yahoo dot com for personalized discussion.