1:
http://www.odd-sex.com/info/gloss283.htm
"Felching: sucking semen out of vagina or anus; or inserting animals into anus or vagina "
2:
http://www.lgbthealthchannel.com/stdmsm/fetish.shtml
"Felching (consuming semen from partner's anus)"
3:
http://www.bizarremag.com/ask/sex.html
"Felching is sucking cum out of someone's arse. Some people do it with a straw. "
4:
http://skelbimas.lt/asirtu/archive_en/felching.htm
"Felching - consuming the resultant semen after anal sex. "