I think the reason people criticise Paul is simply because he frustrates everyone watching even more than he frustrates Leora!
Everyone wants Paul to give Leora a skilful sex session. Watching him fumble around like an over excited 14 year old is embarrassing. If he is studying then for the sake of his relationship with Leora he needs to study how to please his girl. Being a selfish, one time, short and less than sweet lover is going to undermine his relationship if it continues.
Learn how to caress her body, discover where her clit is, understand that a good licking is as pleasing to her as a good fuck. Understand that fingers can be very useful if used correctly. Learn to pace himself and even continue for a second time even if you are not really up for it. Think about pleasing her rather than just using her to please yourself. If he studied these things and learns fast he can then get back to his other studies.
Go for it Paul!!!