I have had a lot of success recently with wearing PJs or sweatpants during a session instead of nothing. The pants add the slightest pressure that keeps the aneros from coming out. This has allowed me to fully relax/push out more and really figure out what feels the best.
Btw I have the Helix Syn. Would a different model help with keeping it from coming out without it being too uncomfortable?Source: https://www.reddit.com/r/aneros/comments/rvdxpj/something_that_worked_for_me/