There's not good evidence for testosterone being more prevalent in professional atheletes though. Some studies even found many top level male athletes have a lower than average amount. Seems to be a very weak correlation at best. More testosterone can improve performance, but you still don't find it in larger amounts in athletes.
I don't know why having good blood circulation might lead athletes to rape someone, that's bizarre to me.
Isn't it much more likely that because they are rich and have status they more often have the mindset of they are better than others and shouldn't be rejected?
I don't know if professional athletes commit more sexual assaults than "average" persons and I would be careful to just assume it is true but from a logical perspective, it would at least make sense to me as well. Without wanting to judge or shame anybody, but from my experiences professional athletes generally adored by many women, especially in night clubs or bars. Even leaving the psychology aside, I would assume that lots of sexual encounters with unknown partners probably under the influence of alcohol in itself increases the probability of something unconsensual happening.
But I think especially in your younger, formative years, being that wanted and able to pick almost freely who you want to hook up with does something with you. Especially when there's an "imbalance of powers" between both parties and one wants to be liked by the other more than the other way around - maybe you get away with more and expect it be like this all the time. Dealing with rejection and developing self reflection is something very important for every young adult and if you never experience this, chances are you deal with it wrongly when it finally happens. Add to that an echo chamber of arse lickers that surrounds you and suddenly you think it is impossible that somebody says no to you.
After all, we all need outside feedback (and rejection) to develop a moral compass and if almost the entire feedback that reaches you is supportive, I would guess that derails you. I mean, the human brain is only fully developed after 25-30 years and self-reflection etc. is usually something that emerges later on. Those guys are used to this lifestyle from 18 years onwards, in most cases the adoration starts even earlier.
In my opinion educational work and information campaigns are still the most important factor to prevent this from happening, not only regarding professional athletes. Many in here seem to be rather pessimistic about it but I actually believe society's on a good path in this regard. Me Too has created lots of awareness and in general I think younger generations are already much more aware of the topic.