This one reminds me of a bunch of cc.commers
http://www.smh.com.au/articles/2003/01/22/1042911440206.html
"The male relies on his arm as much as his penis to have sex"
that's just not true. in fact, it's almost complete bullshit. although, on warm days you get heat conducted into the ice by the screw and a surface water film/less thread contact with ice.
lighter ropes = less mass, higher proportional surface area. not quite sure if this leads to increased rope-on-rope friction or what exactly.
on any diameter of rope, tangles can be avoided through proper management tricks.