Ichi The Killer also opens with a scene with cum, but it's been a while since I saw that one, think the title of the movie appeared from a puddle of semen or something. That movie is pretty intense anyway, definitely not for everyone.

There's Something About Mary is another very (in)famous one. Cameron Diaz unknowingly uses a load from Ben Stiller as hairwax there.

Anyway, you can also do a keywoard search on IMDB, try searching for the keyword semen for example, it'll get you a list with movies tagged with semen (or copy paste this link: www.imdb.com/keyword/semen/)

EDIT: You might wanna check out this link too: http://www.facialforum.net/showthrea...hlight=spuiten

It's about a Dutch tv show about sex and drugs that did a segment about bukkake.