Bringing up sex that soon, that intently doesn't give the impression of someone looking for a long-term thing.
Sounded like rebound talk,.
I wouldn't be comfortable around someone who gave away their details so freely either.
It doesn't speak well of their judgement or their attitude towards responsibility.
As to wether he is over his ex, that's,assuming there is an ex, and that wasn't a very poor pity play. I dunno 6 months is not very long, and it's possible he just wasn't in to her.
His trying to get you to go over to his, again smacks of poor judgement and an inability to see how his actions might look from the outside.
...His behavior reminds me of people when they drink.

If you REALLY like him slow things right down and see how things go from there. Avoid talking about sex, try getting to know more about him.
And if u do meet...make sure it's somewhere public and let someone know where you are going.

Best of luck bp, I hope whatever happens things turn out for the best.