You will need 3 things.
1) standard talent release form ( just google "talent release form")
2) you need a scanned copy of the talent " government issued ID" that the talent is older then 18 years.
3) if you are located in USA you would need a record keeper ( usually a lawyer who keeps these records) but sice you are in France you ONLY need a legitimate address on your site where these records are kept ( no numbered mailboxes).
Also if you are NOT in the USA you can publish on your site that: " even though you are not US producer and thus US laws do not apply to you, you voluntarily comply with USC 2257 ....etc.etc.
Just look at any foreign adult website and you will find the right legal language. If you just licensing content to US company, then you must convince them that you have complied with 1, 2, and 3 above.
They will deal with the rest.
