Okay, for the original poster of his thread, whose name sounds really weird when read aloud by my talking computer...
Tits = tetas (TAY-tahs)
breasts = pechos (PAY-chohs) or senos (SAY-nohs)
nipples = pezones (peh-ZOH-nehs)
semen = colloquially leche (LEH-cheh) "milk"
Balls = ??? I used "bolas" or "aguacates" (avocados, Mexican slang)
ass = culo (KOO-loh)
buns = nalgas (NAHL-gahs)
Rimming/"Asian" = besos negros (BEH-sohs NEH-grohs) "black kisses"
Also called salad tossing...
beer = cerveza, obviously, but the ticos also use "birra"
A nice thing to say:
"Me gustaria desayunar desnuda contigo"
= "I would like to have breakfast with you, naked."
Hueles rica/deliciosa = "You smell wonderful/delicious"
Quieres bailar? = You wanna dance?
Te molesto si fumo? = "Mind if I smoke?"
Okay, now I'm just rambling...but if any non-Spanish speaker would like to know a specific phrase or word, PM me; if I don't know the answer, I'll find out. Again, please check out the Paul Glassman page about costa Rican Spanish; it's useful, printable and free. And no, I'm not shilling for them; I just think it's a decent resource.
http://www.paulglassman.com/cr14.htm