Archive footage was used in the 2000 films Hot Sessions 11 and Hot Sessions 12. The following year, under the alias 'Sebastian', he appeared in solo masturbation scenes for three Club 1821 pornographic films: Young, Hard & Solo #2, Young, Hard & Solo #3, and Hot Sessions III. In 1993, aged 19, Rex responded to an advertisement in a Los Angeles magazine and agreed to be photographed nude for photographer Brad Posey and his Club 1821 studio. Career Early work in porn and on MTV (1993–1998)

At age 18, he was attending community college and working at a potato-sack factory when he began dating and living with a model in Oakland. Rex's father was a breath-work coach (in the tradition of alternative psychologist Stanislov Grof) who walked out on him when he was little. Rex was an only child who grew up in the San Francisco Bay Area. Rex was born in San Francisco, California, and raised in Alameda, the son of Zoe, an environmental consultant, and Paul, a relationship coach. 2.4 Film career resurgence (2021–present).2.2 Television breakout and film work (1999–2017).2.1 Early work in porn and on MTV (1993–1998).