Can I have multiple checkboxes under one heading?

e.g. if I want a "contact method" category where members could select any of email/phone/..
I wouldn't want the db to desplay a series like
contact by phone yes
contact by email yes
and so on
but rather have a group of check boxes with values phone, email, etc
so the db would output
Contact me by phone email

suggestions on how this can be done most welcome


Nic