Well, should you be one who has LOTS of sex, and rarely get massages, you’d probably want a massage. Sex takes up a lot of energy.
Should you be one who gets LOTS of massages, and rarely get sex, you’d probably want the sex. Massages motivate you.
I’m guessing your sex life is A+… or possibly really sucks. I’m hoping it’s good, for your sake.
In a case where I was getting both sex and massages equally and had to pick between one or the other for the night… I’d probably stick with having sex.