Sure, why not. I don't see the reason why i should not if he requests for the loan in cryptocurrencies, after all having to use cryptocurrencies for our daily transactions is what we wish to see and so if someone requests a loan in cryptocurrencies i would give it out. However i prefer dealing with bitcoins but whatever the case maybe i would want him to pay me the exact amount of bitcoin i sent and not it's dollar equivalent at the time of transaction.