correspond

verb3

1. •
   To be equivalent or similar in character, quantity, quality, origin, structure, function etc.
2. •
   To exchange messages, especially by postal letter, over a period of time.

   • I've been corresponding with my German pen pal for three years.
3. •
   (euphemistic, no longer used) To have sex with.

   • When a Babylonian and his wife had a mind to correspond, they always first lit up the fuming pan, imagining it improved the passion. — 1756