"Hands-free fellatio" was popular for a while, but I'm sorry to say that it may not look as good, but what really feels good physically is "fellatio that actively uses the hands." Men will make strange deep readings into the woman's history (preconceived notions), such as "Did she get taught by a previous lover?" or "Maybe she's worked in the sex industry?", and they will inevitably ask her, "Where did you learn that?"