Prostitution engaged in after getting permanent residence is not a grounds for deportation. However, if you were a prostitute in the 10 years prior to getting permanent residence, that is an inadmissibility ground — a ground for denying permanent residence. If you were inadmissible when you became a conditional permanent resident, you may be deportable now. However, to be inadmissible for prostitution, you must have engaged in sexual intercourse for pay on a substantial, continuous and regular basis. It is unclear to me whether you are inadmissible using this test. Because of a law enacted in 1990, if you engaged in prostitution after you got your green card, this is not a ground for deportation.