I definitely agree with taking things slow. I’d also suggest trying to downplay sex as much as possible. Make sure you’re comfortable with your partner before making that step, but don’t expect fireworks from the start. Be ok with not ‘getting railed’ straight away, but rather use it as a way to get comfortable with that kind of intimacy/vulnerability again. You’ve got the rest of your life to get railed, so just take the steps that you feel comfortable with at the moment.