The main language of communication there is Spanish.
It is the state language in Mexico but there is also widely spoken English.
Whatever your type, you'll be able to find it here.
However, meeting them isn't as easy as one might think.
Second, not everyone here speaks English, particularly the normal, more wholesome girls of Tijuana (remember, many here are migrants from other parts of Mexico). Even though more people speak English here than they would in, say, Guadalajara, your perceived value will be much higher among Tijuana girls, simply because they won't expect you to speak any Spanish.