What financial compensation would be appropriate if asked for pose porno?

I've been offered financial compensation in return for nude/pornographic images and video of myself, and a partner if I wanted. Where are the lines on this? I do not want to overcharge, am quite comfortable nude and on camera, but wish to not undersell myself. Where do I go with this?|||It depends on how the pictures, video will be used. If they will be sold get a contract and a percentage of sales, negotiate, start at 50% but do not go less than 15%. If it is for personal use by someone or for artistic purposes charge by the hour if it takes longer than 2 hours about 100 per hour. And keep track of time, get 50% of the money up front (along with an estimate of how much time it will take) and the rest on completion. Also have whoever is hiring you sign a guarantee that the pics will not be sold and if they are you will be compensated at the percentage rate of whatever amount you agree. If the shoot takes 2 hours or less get a flat fee of $200 payable in cash before you take your clothes off.|||They should at least provide a catered lunch/dinner and taxi fare to and from the shoot