Twin directories of twins:

[DIR]  ftp://c64.rulez.org/pub/c64/Hall_of_Fame/demofiles/t/twins/
[DIR]  ftp://ftp.asstr.org/pub/Collections/nifty/lesbian/incest/twins/
[DIR]  ftp://ftp.asstr.org/pub/Collections/nifty/bisexual/incest/twins/
[DIR]  ftp://ftp.astro.uni-bonn.de/incoming/twins/
[DIR]  ftp://ftp.astro.uni-bonn.de/pub/glay/twins/
[DIR]  ftp://ftp.astro.uni-bonn.de/pub/twins/
[DIR]  ftp://ftp.back2roots.org/pub/back2roots/cds/tscc/no_fragments_01_v10/msa/t/twins/
[DIR]  ftp://codeblocks-contrib-libs-8.02-3.fc10.ppc.html/pub/back2roots/cds/tscc/no_fragments_01_v10/msa/t/twins/