Since the context of the OP is current and not historical, I can only think in terms of this culture and at this time - it has been known since well before the 60's that women are sexual, and quite capable of [bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse]. I think, rather, that resentments build when one has a higher libido than the other and does not feel their needs are being met by the lower-libido spouse. And of course there wouldn't be scriptural support for this resentment because it is rooted in the flesh and in the ego (self).
Going along with your assertion that sex is a wife's right and a man's responsibility, that very well may be true, but if we take scripture as a whole, the emphasis is on men and women both becoming more like Christ, it is on the mutual and reciprocal love relationship of Jesus and the church, it is on loving like Jesus loves, which means pouring yourself out for the sake of the beloved. It would be a good idea for men and women to take this principle into the bedroom (or living room, laundry room, shower, car, etc) as well, where loving spouses will meet their partner's needs as far as it depends on them. Perhaps the women's "right" to sex was written in because it was already assumed culturally that a man had a right to sex and at the age of marrying would likely "require" this on a frequently regular basis. Today it might be fairly safe to assume (because to my knowledge sex is not written into the marriage contract) that sex will be decided on by both spouses - remember there is such a thing as marital rape, but a lot of people also use sex as a means of marital manipulation, control, and as a weapon of power within the marriage. I think this is part of why we have the passage that says a wife's body is no longer only her own but also belongs to her husband; likewise, a husband's body is no longer his own, but also belongs to his wife.
Either spouse has a right to say no, but "marriage" implies a sexual obligation or responsibility to our spouse, and if we bring in spiritual concepts like selfless, serving and sacrificial love, we can grow spiritually in the bedroom with our spouse.