Even if he wanted to, he can't. That would mean giving you his PSN log in details and he's not about to do that. Plus Sony has measures in place to make sure no one crashes the Home beta- doing that could make him get kicked out of the beta, leaving both people out.
This is maybe as good a time as any to say this- do NOT share your log in details for PSN, this site or anything with anyone (even friends or family). We've had several cases here where friends or family have logged in as someone and promptly acted like asses. You can guess what some may do because they think it's funny if logged into PSN and you have a credit card stored in the info for PlayStation Store purchases.