79th base
"gaben: "we're proud to announce that [gordon freeman] and [alyx vance] achieve 79th base in half-life episode 3: the return to xen
sex while time traveling/having sex in a parallel dimension
""gaben: "we're proud to announce that [gordon freeman] and [alyx vance] achieve 79th base in half-life episode 3: the return to xen" What is the definition of "79th base"?