Poor bloke, and poor OP, but OP. please do not let his problems make you feel unattractive and crap. it's not - it's him, or rather, I think, it's his mindset.
The struggling to ejaculate inside you is a big sign, there's something going there; the stressful, highly religious household upbringing has definitely not helped, ''they fuck you up, our parents do, they don't mean, but they do....'
As mentioned earlier, stress relieving tactics, like different times of day, sneak away for a night out, are all great, and try to remove the pressure of needing a fully erect cock and ejaculation, try to relax and have intimacy as well. And fun. Do not forget the fun element.
And as mentioned, Viagra; it is possible to purchase Kamagra online (generic Viagra) from heaps of sources, and we use it for 'special' weekends, like when the kids are away and we are doing some serious catching up. It adds a tremendous zip to proceedings, :) I can highly recommend it. The added bonus to this, is that even after the drug has worn off, because you've spent the last 12 hours or so feeling a little more, erm, eager, I find the mental effect carries on for a couple of days after.
Good luck OP, hoping you can improve yours and your partner situation .