Related for Ketubot 111:9
אלא חופה קשיא חופה נמי לא קשיא כיון דסתם חופה לביאה קיימא אורח ארעא קא משמע לן דבלילה
But if it is huppah [that acquires] this is difficult. [The assumption that acquisition is effected in the] huppah also presents no difficulty. Since, usually, the huppah is a prelude to intercourse he taught us that it was proper that [it should be entered] at night.
Tosefta Kiddushin
"[Be betrothed to me] with the understanding that if I die you will not bound to a levir"—she is betrothed but his stipulation is invalid, for he stipulated against what was written in the Torah, and anyone who stipulates against what is written in the Torah, his stipulation is invalid. "With the understanding that I will have no responsibility for you for clothing or sex"—she is betrothed but his stipulation is invalid. This is the pneumonic: Anyone who stipulates against what is written in the Torah regarding a monetary matter—his stipulation stands; with a non-monetary matter—his stipulation is invalid.
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