According to research, a woman's sex drive tends to increase after the age of 30. A man's sex drive tends to decrease slightly after 30.
That being said, statistics tend to be only hasty generalisations.
Most of us horny men here will continue screwing around till we reach 100 or until we die, depending on which comes first.
Women after 30 may also have a strong aversion towards sex after some negative sexperiences (rape, etc).
A few questions for you to ponder Sis Lovetorn. No obligation to answer if you don't feel comfortable.
1) Are you over 30 yet?
2) Before yr current BF, did u have any negative sexperiences with anyone?
3) How did u both get attached in the first place? Did it start with a bang - due to intense physical attraction - love (lust) at first sight? Or is the attraction slightly milder but gradual, based on a kind of friendship / familiarity where you feel comfortable with each other's presence?
The 3rd question is difficult to answer as he may be deeply attracted to you sexually and you may love him for other reasons.
Some say that men use love to get sex, women do the vice versa.
Men & women can be wired differently. At the end of the day, if you are seriously considering him as a life partner, then both of you need to honestly sit down, confront these issues and decide if the exchange (difference in objectives & perspectives) is acceptable and worth the compromise.
My 1 cent worth.