A revolting sicko has been convicted after putting semen in a colleague's water bottle.
Stevens Millancastro, 30, was found guilty of the vile acts which took place after his co-worker rejected him, a court heard.
The California man also put semen on the woman's workspace, as well as a bottle of honey she used for her tea.
Millancastro was convicted on assault and battery charges on Monday after his attempts to retaliate to the colleague who filed a complaint against him to the HR department.
The female worker rejected his advances after he asked her out on a date.
She also asked her boss to tell Millancastro to stop staring at her, according to prosecutors.
However, when he did not stop, she filed the complaint.
Upon arriving to work, the woman found a "cloudy substance" in her water bottles on several occasions.
Her boss then agreed to place a surveillance camera facing her desk, and when she arrived one morning to find a "milky white substance" on her keyboard the footage was checked.
According to Mercury News the footage showed the Millancastro had waited until the woman left before smearing the substance from a tissue on to her keyboard.
His semen was also found in the water bottles and jar of honey, say investigators.
The woman's testimony stated that Millancastro made her feel "very, very uncomfortable."
She said she was "disgusted" to find the bodily fluid on her personal property.
Millancastro's defence lawyer, Michael Morrison, accepted his client's actions, however argued the defendant was acting in retaliation of the complaint filed by the woman, rather than sexual gratification.
The defence also argued Millancastro was angry he thought he would lose his job, and wanted revenge.
The crimes occurred in La Palma, between November 2016 and January 2017.
A sentencing is due to take place on October 6. Millancastro could face up to two years and six months in prison, and he will be required to register as a sex offender as he committed the crimes for sexual purposes according to the judge.