@Francisco
Lawrence v. Texas 539 U.S. 558 (2003) is the case where the Supreme Court said that the government can't pry their eyes into what happens between consenting adults and overturned Texas's anti-sodomy law on the basis of 14th Amendment Due Process violation.
You can cycle with your friend anywhere in the US.
My school has the "Oyez Project" where you can find out a lot of interesting information on almost any Supreme Court case.
Here's the link for Lawrence v. Texas.
http://www.oyez.com/cases/2000-2009/2002/2002_02_102