Sam laughed, sliding his arms around Joanie's waist and pulling her to him, so she was almost in his lap. There wasn't any space between them, that was what he was going for. He kissed her lips a few times, one hand slipping up her shirt to rub her back - he just wanted skin, damnit, and she was warm. "Yes, I could talk about Punnett's Square. An offspring's genotype is the result of the combination of genes in the sex cells or gametes that came together in its conception. You like that?" He said 'sex cells.' That ought to turn her on, no?