Wiktionary
marriage bed
n. The bed shared by a newly-married couple.
WordNet
marriage bed
n. the bed shared by a newly wed couple
Usage examples of "marriage bed".
But I shall be a good husband to you tonight, and let you recover from your first taste of the marriage bed.
And-listen to this, my dearest-if I am here with you, my Gwenhwyfar, then should a child come of this, then you may swear without any untruth that this child was conceived in your marriage bed, and none of us need ever know for certain-dear love, will you not consent to this?