Sexual frustration or sexual starvation in humans is frustration caused by a discrepancy between a person's desired and achieved sexual activity. It can be a result of obtaining less sex than desired, or of not being satisfied during sex (which may be due to issues such as anorgasmia, premature ejaculation, or erectile dysfunction).
Sexual frustration can result from an individual lacking one or more of the organs needed for sexual release but still having one or more of the organs that cause a the sex-drive. For males it could be that they have testicles and no penis; a male might be born without a penis (aphallia) or be born with one and have it removed (penis removal or penectomy). Men can still ejaculate via prostate stimulation in that case. For females they might not have a clitoris which causes sexual pleasure; a female might have had her clitoris involuntarily removed (female circumcision) or voluntarily removed as part of a medical procedure.