The big O.

Eureka
Hello ladies.this may sound odd but Im 41 and have three great kids and am trying for a fourth. I have a hard time reaching an organsm. I know this is odd I have had them but it has been after a long time of direct penetration to my clitoris. I am not sure why this is but that's what is happening. I am married to a great husband and we have an active sex life but no Orgasm for me. What can I do? Should I tell my husband? Sex is so great I just can't get to that point of release. It maybe weeks or even moths with no O. Help