Laptop heat risks 'Toasted skin syndrome':

Swiss researchers have recently discovered that prolonged laptop heat exposure could lead to permanent skin darkening, and in rare cases, can cause damage leading to skin cancers.

Link to some articles regarding laptop heat and toasted skin syndrome:
http://www.pddnet.com/news-ap-no-laps-for-warm-laptops-skin-damage-is-possible-100410/

http://www.engadget.com/2010/10/04/toasted-skin-syndrome-caused-by-extreme-laptop-heat-say-resear/

http://www.msnbc.msn.com/id/39490660

http://news.yahoo.com/s/ap/20101004/ap_on_he_me/us_med_laptop_toasted_skin

Link to the Official Journal of the American Academy of Petriatrics:
http://pediatrics.aappublications.org/cgi/content/abstract/peds.2010-1390v1?maxtoshow=&hits=10&RESULTFORMAT=&fulltext=toasted+skin+laptop&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT

Laptop heat risks male infertility:

Scientists at Stony Brook University Hospital on Long Island have discovered that Laptop heat can impair male fertility.

Link to some articles regarding laptop heat and male infertility:
http://www.medicalnewstoday.com/articles/17612.php

http://www.webmd.com/infertility-and-reproduction/news/20041208/laptop-computers-may-affect-male-fertility

http://www.timesonline.co.uk/tol/news/uk/article400872.ece

Link to Human Reproduction journal:
http://humrep.oupjournals.org/cgi/content/abstract/deh616v1