The 'Angus is a Virgin' hypothesis (it's not even a theory) while funny, is not exactly likely.
Sure he's a bit awkward, but most guys are. And if you're comparing him to Sven, that's not exactly a fair sample.
We know that Angus has been in at least one serious relationship (at least serious enough to not visit CoD during its duration) for at least long enough to know that his ex was apt to belittle people, and it would be unusual for a hetero relationship not to include sex.
And as to him checking on whether his supply of condoms are still handy, while it may not be smooth, is actually pretty respectful and responsible. Of course Faye is going to give him grief about it! It's how she rolls, and he digs it, hell, for these two, it's practically foreplay!
Angus isn't perfect. He's probably not even perfect for Faye, but there's only one way for them to find out. She's willing to give him a shot, maybe we should too.