Wife asked if I'd be willing to suck and swallow her lover

He's not gay, etc.
The stigma for men due to social conditioning is much higher than for woman. (In my opinion). It also a reasonable fear of being seen as less masculine. No woman has ever been thought of as less feminine if she fooled around with other woman. Not the same standard for men. FWIW I don't think sucking cock makes anyone gay even if it is a "gay act". No more than a woman kissing another woman would make her gay.
 
The stigma for men due to social conditioning is much higher than for woman. (In my opinion). It also a reasonable fear of being seen as less masculine. No woman has ever been thought of as less feminine if she fooled around with other woman. Not the same standard for men. FWIW I don't think sucking cock makes anyone gay even if it is a "gay act". No more than a woman kissing another woman would make her gay.
That makes a lot of sense.
 
The stigma for men due to social conditioning is much higher than for woman. (In my opinion). It also a reasonable fear of being seen as less masculine. No woman has ever been thought of as less feminine if she fooled around with other woman. Not the same standard for men. FWIW I don't think sucking cock makes anyone gay even if it is a "gay act". No more than a woman kissing another woman would make her gay.
Yeah, it isn't always perceived as an equal comparison. Somehow the act of a man sucking a cock is portrayed as being submissive or effeminate and not so much with women that enjoy other women.
 
No woman has ever been thought of as less feminine if she fooled around with other woman. Not the same standard for men.
Well... men are more often seen as less masculine if they fool around with other men, especially if they're bottoming.

However, 'butch lesbian bulldyke' is a thing I've seen thrown around at women who fool around with other women. Not always, probably less common than less-masculinity for men, but I have seen it.