Beck served as spokesman of the Association of Lesbians and Gays in Germany (Lesben- und Schwulenverband in Deutschland) LSVD for over ten years.

On the last day of his parliamentary career, he received a standing ovation following the approval of same-sex marriage bill in the German Bundestag.

During his time as his parliamentary group's spokesperson on human rights, he described the repeated prison sentences against Mikhail Khodorkovsky and Platon Lebedev as "disproportionate."

"[5] Beck spoke in favor of continuing European Union sanctions on Uzbekistan, originally instated after the Uzbek government did not allow an international investigation of the Andijan massacre, on 17 October 2006.

Alongside Otto Graf Lambsdorff, he negotiated the $4.6 billion fund to compensate people enslaved by the Nazis and later served as one of the trustees of the Foundation "Remembrance, Responsibility and Future".

The company apologized and pledged to donate 10,000 condoms as well as the proceeds from the NPD order to a German foundation against right-wing extremism and anti-Semitism.

An appeal for a realistic, new orientation of sexuality politics" which promoted the decriminalization of pedosexuality, was released in full by Spiegel Online, showing that editorial changes had not altered the message of the essay as he had claimed.

[18] Beck later entered into a relationship with architect Adrian Petkov, and after registering their partnership in the summer of 2017, the two married on the first day of legal same-sex marriage in Kreuzberg.

[19][20] In March 2016, a police search based on reasonable suspicion that Beck had purchased and was in possession of a small amount (lowest classification under German narcotics law) of a controlled substance, lead to the seizure of 0.6 grams of an alleged drug.