When he's stood over a half naked Asuka and he jerks off over her, I was 
thinking "what a fucking wuss".

If you had been Shinji in that situation and you had a comatose Asuka lying 
in front of you with her tits exposed, would you only jerk off on her?

Why not fuck her? Or at least fuck her mouth? Or use her hair to jerk off 
with? There is so much more that Shinji could have done in that situation. 
What would you have done?