According to this site it sounds very
possible:
"Sexual Transmission:
You can get crabs whenever some part of
your body that has coarse hair (such as
the pubic area, eyelashes, eyebrows,
facial hair, chest, or armpits) comes into
contact with the infested pubic or other
course hair. Crabs do not usually attach
to head hair.
Most cases of crabs are transmitted
through sexual contact, when the crabs
move from the pubic hair of one person to
the pubic hair of another. Even when there
is no sexual penetration, you can get
crabs or transmit crabs to someone else.
Nonsexual Transmission:
Nonsexual transmission of crabs is also
possible. A person can get crabs from:
* sleeping in an infested bed or using
infested towels.
* wearing infested clothing.
* an infested toilet seat, though this
is rare."
http://www.ashast
d.org/learn/learn_crabs.cfm#3