Secondary contact can transmit the disease as well. For example, fondling, foreplay, and petting will all transmit the virus pretty well. It's best to ask your partners if they've ever had warts. Finally, women who have warts in the birthing canal can pass the disease on to their baby during birth. Babies can be infected on their genitals, but this is rare.
Babies usually get warts in their throat from birth.
They are painless but can grow so big that they block your urethra, vagina, anus, or throat. But warts can also be so small that you can't see them. Of course you can still spread them even if you can't see them. Warts can be burned off with laser, or frozen, or treated with chemicals. This gets rid of them for a while.