This is a meaty subject!!
I am amazed at the response this simple question, but complex, matter has generated. I don't feel that sucking a bull's, or any one else, cock makes you a sissy, but I do think it makes you at least bi-sexual if you do it more than once, but if you do not like it, and only do it because you are ordered to do so by sexually superior bulls or your mistress, it just makes you a submissive and subservant male who is a slave to his mistress and her bull.
My opinion, we all have one and an asshole, and sissies are born with a desire to be feminine, like sexy clothes, and yes desire to suck cock and be fucked in the asshole. They wish to be coverted and used, but sometimes want someone else to make the decision, because we are not only effeminate, but very submissive, cock sucking sluts. More an more we are coming out, but social pressure, still demands many be very descreet, but desires a GF/Wife/Mistress for social/business purpose. The sissy and a faggot are much the same. Sissies do desire sex as a general rule, but other than oral and massage, etc they can not do much for the female, but get hard seeing their women fucked.
A cuck is a sexually, otherwise, inferior male who knows his wife is seeing other males.. If he does not know, then his wife is just a garden varity of adultress, but once he finds out and stay in the union he is for ever more a cuckold. Some men desire their women to cuckold them, and get off on the humilation, excitement and being dominated by the Mistress and her lovers. If he sees men outside of the union, he is Bi-Sexual or Gay. You do not have to be sissy to be Bi or Gay, but many sissies are bi or gay.
All women are not cut out to be cuckoldress/mistress type and some because of religion, education, social pressure feel sex is only for procreation of the race, or just do not like sex, or are lesbian. A cuckoldress, that is a Hot Woman, *****, Slut etc is a very special type of woman sought after by many men. They are promiscuious, have no qualms taking off their clothes and often have been strippers/escorts/, but more are from every day jobs like school teacher, secretary, and are wives and moms that deslre sexual satisfaction