Seed drill further refined by Jethro Tull in 1701 in the Agricultural Revolution. However, seed drills of this and successive types were both expensive and unreliable, as well as fragile. Seed drills would not come into widespread use in Europe until the mid to late 19th century, when manufacturing advances such as machine tools, die forging and metal stamping allowed large scale precision manufacturing of metal parts. Early drills were small enough to be pulled by a single horse, and many of these remained in use into the 1930s. The availability of steam, and later gasoline tractors, however, saw the development of
I Invented Sex just the thing to boost the already-substantial sales of Songz' third album." In the song's remix, Songz makes references to Tiger Woods, as he also refers to "going in like a Lil Wayne-Drake song." "DJBooth" said that Songz sings alongside, "Usher, who basically invented the modern sexual r&b blueprint that Songz is following, and Hilson, who more than holds her own alongside the boys with some scintillating vocals and hilarious 'soldier at attention' sexual entendres." The review goes on to state, "These three may not have invented sex, but they sure make listening to music while having sex more enjoyable."