Not stupid at all CLJ -

Vixens almost always have condoms with them for fs.
However, you may want to get a dozen or so of a type you particularly like, and carry those around, especially if you  have the Curse of the Long Schlong.
Think of the pain of fitting a size 12 foot into a size 9 shoe.

Lubricated vanilla flavored microthins always get a response from a vix. Cherry flavored is popular.
You can order over the Net from Adam & Eve for example.

Sometimes a vix will have a condom that feels too thick, as if it were made from an old tire off an 18 wheeler. Then you'll be glad you have your own with you.

will not allow you to use your own, especially if it is your first visit to her, possiby because of suspicion you may have tampered with the condom for some nefarious purpose.