It depends...When I am really into licking my lover and she is close to an orgasm, I tend to go semi-soft because I am consentrating on her pleasure. After she is orally satisfied and ready to fuck, I am rock hard.
Anal sex was such a when I was growing up. I met a woman that was very big into it. She would insert a vibrator into her pussy as I slid my cock slowly in and out of her ass. It was and amazing feeling. Then she took it out and slid it up my ass as she finished me with a blow job. Wonderful experience. Try it