Is there a relationship, per studies, with regard to taking aspirin and hemorrhoidal. bleeding?

Not exactly: Aspirin permanently blocks platelet functioning, so any bleeding is longer and more pronounced. It is one of the risks that must be accepted for the benefits of Aspirin therapy. If questions or concerns, you should discuss with your dr.

Definitely yes.: Aspirin, or any other blood thinner, can make hemorrhoids bleed. Many studies demonstrating this fact can be found at pubmed.