It's not my place to judge whether what you two did was right or wrong or what or on the responsibility of it, but I think it is in the best interest of you both to reevaluate what your actions (speaking in the plural) led to, and what can be done so this does not happen again.

Alcohol lowers our inhibitions, making things we would normally never do seem acceptable or otherwise seem like good ideas (such as beer goggles). I don't think either of you were drinking responsibly, tbh.

As for you two, sit down with each other. Discuss how you feel about this honestly, and what needs to be done to bury this and ensure it never happens again.