Gee gollies gals, when the weight-trained/doped feminine muscle (a.k.a. sexy curves) begins to approach the levels of the 70's Mr. Olympias [e.g. the "look" of an Iris Kyle or (heaven forbid!) a Renee Toney, then the virilization line has definitely been crossed!!
I believe I am safe in saying that all dedicated weight-training men truly admire and appreciate BB women, as we have been in the gym, in the trenches, training beside them since the 80's.
Also, the limit of "sexy feminine muscularity" desired/admired by most men is to the level of the "look" of the top pro. IFBB competitors of the 80's; as exemplified by Rachel, Carla, Cory, Marjo, Gladys, and Anja (I would even include Sandy Riddell in this sexy feminine muscle group). This sexy, feminine, muscular look is DEFINITELY more appealing to us body-conscious BB guys than the "borderline anorexic" runway model look with their pipe-stem arms and bird legs (despite their very pretty faces). Men who refuse to recognize and accept this truth are simply insecure!
However, the competitive FBB look of the 90's, as exemplified by Lenda and Kim, was very borderline virilization and the "look" of Iris was/is definitely over! I think I speak for the majority of dedicated BB men regarding these strictly "physical appearance" comments.
Another factor is the masculine, deep, husky, voice that is developed by these AAS taking FBB competitors. This deep voice is definitely not a "husky sexy voice" but sounds more like Humphrey Bogart and is a real turnoff to a lot of BB men.