No, Loki's never met Jane. I think he's jealous of the emotional connection Thor has with her rather than any sexual reason. Either of them could boff half of Midgard without breaking a sweat, not to mention the rest of the realms. Loki was probably too creepy to score in Asgard, though.  Snooty Æsir wenches. :P<br/><br/><div class="spoiler_container"><div class="spoiler_header" onclick="hideSecond (this);" role="button">This bears repeating...</div><div class="spoiler_body">(http://25.media.tumblr.com/tumblr_m7oh52Wsjf1ransqto1_500.jpg)<br/><br/>(http://25.media.tumblr.com/tumblr_m7p09fBIwf1rv7osmo1_500.jpg)</div></div><br/>What would be fun (for Loki) would be to put on a Thor disguise and go treat Jane like dirt, with the goal of causing a rift between them.