Question
QUESTION: I have read you have to plant both male and female trees in order to produce fruit. If I plant seeds how do I know if I have both male and female

ANSWER: Hi Milton,
Thanx for your question.  I know of no way to differentiate the seed that will produce a male plant versus a female plant for persimmons.  I've had kiwi seeds which also produce plants that require a male and a female plant.  There was no way that I could tell to differentiate the seed.  I'm sorry.
Tom

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QUESTION:  how do I tell the difference between a male persimmon tree and a female persimmon tree

Answer
Hi Milton,
Thanx for your question.  I previously answered this one a few weeks ago.  Sometimes if you quickly browse past answers you may get your answer quicker if I've already answered the question.  At anyrate, here is a link to pictures of the flowers, which is how you will identify a male tree vs a female tree.  Male flowers are small and in clusters, females are larger and single.  I hope this helps.
Tom
http://www.backyardnature.net/fl_prsmn.htm