Just to clarify when I said he seems healthy, they are precious sentient beings and once the committment is made health problems are not an issue when it comes to devotion (I have a diabetic cat, and love him more as a result).
And actually after watching some popping videos, if it is a he (the guy at the store said it looked like a he) then well...it is not all that obvious. A vet visit will be in order, for parasites and gender.
Thank god for the internet! It is such a blessing, to ask questions and get the advice of knowledgable people in minutes is truly wonderful.