My (20f) boyfriend 22m) is usually super hard during oral, even kissing he's often erect. But right before we're actually about to PIV he goes soft and it's kinda a feeling hurter. He was a virgin when I met him and we've had sex about 5 times. The first couple of times he stayed hard, but the last few he goes soft within a couple of minutes if he can get it back up at all. He says it's just performance anxiety, is this normal? He seems to be getting more confident but the issue isn't really getting a whole lot better.
Edit: he does not drink alcohol at all, smokes weed semi frequently, and no mental health issues.
Edit:please refrain from privately messaging me, it's not something I've very comfortable with (but i appreciate all advice and thoughts in the comments)