Here is a link to an interesting documentary about a female bodybuilder:
It gives insights on the challenges she faces, feedback from family and more. Obviously this is not indicative of everything you will face when dating a female bodybuilder or other athletic/competitive woman; but it will give you a starting perspective on being supportive and encouraging should you be in the situation.
If this video and other sources of information give you enough information then start your search for meeting and dating muscular women by clicking the link.
To get a number of places to start going online to meet female bodybuilders, figure competitors, physique competitors and bikini models then start your search here.