You can get posebox from a lot of different sites. MTS, Tumblr, ect. Almost any site you visit has them, for all ages and situations. I only downloaded one once, I don't even remember why, I was trying something (I don't use them really) If I recall correctly, it was easy to use.
I will drop a few links, though there are many, many, many more out there.
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I will drop a few links, though there are many, many, many more out there.
http://modthesims.info/browse.php?tag=posebox&go=Go&gs=1&f=38&gs=1
There is a catalog of quite a few here: http://lachesispbcatalog.blogspot.com/
No worries, I hope you find some things you like.