It really comes down to how the two of you mesh in the sex realm. For instance, y ex husband and I use to have lots of marathons (several times a day all weekend long for instance) simply because our sex drives matched with each other so we had lots of sex.
If your sex drives match then it will be *normal* for the two of you to engage in a lot of sex, including marathons haha. If not, then it could become an issue that ends up becoming unsatisfying and could be enough tow compel the other to either cheat or seek a more sexually compatible partner if its high on their list of needs. The purpose of being in a relationship is to see how well you mesh in a lot of areas (sex, beliefs, finances, goals, likes/dislikes, etc.) that will allow for the partnership to grow and be satisfying (when most needs are met) for each of you over the long haul.
.
