It Was Half-Past The Honeymoon. Orgy Time!
From the back:
It took Lori a while to get over her scruples, but when she discovered what other husbands than her own had to offer, she came to hope that the swap game could do half as much to broaden her husband’s sexual outlook as it had for hers. The other wives found Ted a bit disappointing too . . . and decided that they preferred sharing Lori for lust!